6.3.11
Extinctions
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Extinctions
Extinction happens when there are no individuals of a species left in the world. A change in abiotic (physical) or biotic (relating to organisms) factors can cause an extinction if a species cannot adapt or move to another environment.
Rapid extinctions
- Sometimes abiotic (physical) factors can change rapidly to cause extinctions.
- Large volcanic eruptions can change the carbon dioxide levels in the atmosphere, block light and cause pH changes in soils.
- A meteorite or asteroid impact (like the one around the time of the dinosaurs) would have a similar (but larger) effect to a large volcanic eruption.
Slow extinctions
- Geological and atmospheric changes happening over a longer period of time can also cause slower extinctions.
1Cell Biology
1.1What's in Cells?
1.1.1Types of Cells1.1.2Properties of Prokaryotes1.1.3Orders of Magnitude1.1.4Standard Form1.1.5Standard Form - Calculations1.1.6Addition in Standard Form - Calculations1.1.7Subtraction in Standard Form - Calculations1.1.8Multiplication in Standard Form - Calculations1.1.9Division in Standard Form - Calculations1.1.10Animal Cells1.1.11Plant Cells1.1.12Differentiation in Plants & Animals1.1.13Bacterial Cells1.1.14Types of Cells HyperLearning1.1.15Cell Specialisation in Animals1.1.16Sperm Cells1.1.17Nerve Cells1.1.18Muscle Cells1.1.19Cell Specialisation in Plants - Root Hair Cells1.1.20Cell Specialisation in Plants - Xylem1.1.21Cell Specialisation in Plants - Phloem1.1.22Microscopy1.1.23Magnification1.1.24Developments in Microscopy1.1.25Required Practical - Microscopy1.1.26Microscopy - Calculations1.1.27Culturing Microorganisms1.1.28Contamination1.1.29Avoiding Contamination1.1.30Calculating Bacteria1.1.31Calculating Bacteria - Calculations1.1.32Required Practical - Bacteria1.1.33Exam-Style Questions - Cell Structure & Microscopy1.1.34Diagnostic Misconceptions - Converting1.1.35Diagnostic Misconceptions - Animal Cells1.1.36Diagnostic Misconceptions - Mitochondria1.1.37End of Topic Test - What's in Cells?
1.2Cell Division
1.3Transport in Cells
1.3.1Diffusion1.3.2Factors Affecting Diffusion1.3.3Surface Area : Volume1.3.4Surface Area : Volume - Calculations1.3.5Exchange Surfaces1.3.6Examples of Exchange Surfaces1.3.7Osmosis1.3.8Osmosis 21.3.9Required Practical - Osmosis in Plant Tissue1.3.10Active Transport1.3.11Transport in Cells1.3.12Grade 9 - Cell Transport1.3.13Diagnostic Misconceptions - Water Moving1.3.14Diagnostic Misconceptions - Active Transport1.3.15End of Topic Test - Cell Division & Transport
2Organisation
2.1Principles of Organisation
2.2Enzymes
2.2.1Enzymes2.2.2Enzymes HyperFlashcards2.2.3Rate of Reaction2.2.4Calculating Rate of Reaction2.2.5Rate of Reaction - Calculations2.2.6Digestion2.2.7Bile2.2.8Examples of Digestive Enzymes - Amylase2.2.9Examples of Digestive Enzymes - Protease2.2.10Examples of Digestive Enzymes - Lipase2.2.11Testing for Biological Molecules2.2.12Required Practical - Testing for Food Chemicals2.2.13Required Practical - Enzymes2.2.14Grade 9 - Enzymes2.2.15Exam-Style Questions - Enzymes2.2.16Diagnostic Misconceptions - High Temperatures2.2.17Diagnostic Misconceptions - Low Temperatures2.2.18Diagnostic Misconceptions - Stomach Acid2.2.19Diagnostic Misconceptions - Substrate Shape2.2.20End of Topic Test - Organisation & Enzymes
2.3Circulatory System
2.3.1Types of Blood Vessels2.3.2Blood Vessels - Arteries2.3.3Blood Vessels - Capillaries2.3.4Blood Vessels - Veins2.3.5The Heart - Structure2.3.6The Heart - Function2.3.7Important Blood Vessels2.3.8Double Circulatory System2.3.9Gas Exchange2.3.10Gas Exchange - Calculations2.3.11Alveoli2.3.12Blood Components2.3.13Platelets2.3.14Red Blood Cells2.3.15White Blood Cells2.3.16End of Topic Test - Circulatory System
2.4Non-Communicable Diseases
2.4.1Health Issues2.4.2Disease Interactions2.4.3Sampling2.4.4Sampling - Calculations2.4.5Risk Factors2.4.6Examples of Risk Factors2.4.7Risk Factor Graphs2.4.8Coronary Heart Disease2.4.9Heart Valve Disease2.4.10Heart Failure2.4.11Treating Heart Disease2.4.12Comparing Treatments of Heart Disease2.4.13Cancer2.4.14Cancer Risk Factors2.4.15End of Topic Test - Non-Communicable Diseases2.4.16Exam-Style Questions - Coronary Heart Disease
2.5Plant Tissues, Organs & Systems
2.5.1Plant Organs2.5.2Leaves2.5.3Transpiration2.5.4Rate of Transpiration2.5.5Measuring Transpiration2.5.6Translocation2.5.7Transpiration Tissues - Xylem Cells2.5.8Transpiration Tissues - Root Hair Cells2.5.9Stomata2.5.10States of Stomata2.5.11Premium Knowledge - Transpiration2.5.12End of Topic Test - Plants2.5.13Exam-Style Questions - Plant Tissues2.5.14Diagnostic Misconceptions - Plant Food2.5.15Diagnostic Misconceptions - Plants & Water2.5.16Diagnostic Misconceptions - Plants Don't Breathe
3Infection & Response
3.1Communicable Disease
3.1.1Spreading Disease3.1.2Causing Diseases3.1.3Preventing Infection3.1.4Communicable Disease - Viruses3.1.5Examples of Viruses3.1.6Communicable Disease - Bacteria3.1.7Communicable Disease - Fungi3.1.8Communicable Disease - Protists3.1.9Human Defence Systems - Non-Specific Defences3.1.10Human Defence Systems - Immune Systems3.1.11Antibodies3.1.12Vaccinations3.1.13The Immune System3.1.14The Immune System 23.1.15Antibiotics3.1.16Antibiotic Resistance3.1.17Antibiotic Resistance 23.1.18Drug Discovery3.1.19Developing New Drugs3.1.20Drug Testing3.1.21Drug Testing in Laboratories3.1.22Double-Blind Trials3.1.23Drug Testing / Efficacy - Calculations3.1.24End of Topic Test - Communicable Diseases3.1.25Exam-Style Questions - Microorganisms & Disease3.1.26Diagnostic Misconceptions - Antibiotics
3.2Monoclonal Antibodies
4Bioenergetics
4.1Photosynthesis
4.1.1Photosynthesis4.1.2Photosynthesis Equation4.1.3Rate of Photosynthesis4.1.4Limiting Factors4.1.5Photosynthesis in Farming4.1.6Uses of Glucose4.1.7Photosynthesis - Calculations4.1.8Required Practical - Light Intensity4.1.9Grade 9 - Photosynthesis Experiment4.1.10Exam-Style Questions - Rate of Photosynthesis4.1.11Diagnostic Misconceptions - Photosynthesis4.1.12Diagnostic Misconceptions - Plants Respiration
5Homeostasis & Response
5.1Homeostasis
5.2The Human Nervous System
5.2.1The Nervous System5.2.2The Nervous System HyperFlashcards5.2.3Synapses5.2.4Reflexes5.2.5Components of a Reflex Arc5.2.6Required Practical - Human Reaction Times5.2.7The Brain5.2.8Parts of the Brain5.2.9The Brain: Neuro Techniques5.2.10Retina Scanning5.2.11Eye Anatomy5.2.12Eye Function - Focus5.2.13Eye Function - Light5.2.14Eye Defects5.2.15Thermoregulation5.2.16Hot & Cold5.2.17Thermoregulation - Sweating & Shivering5.2.18Thermoregulation - Body Hair5.2.19Thermoregulation - Blood Vessels5.2.20Body Temperature HyperLearning5.2.21End of Topic Test - Human Nervous System5.2.22Exam-Style Questions - Nervous System5.2.23Diagnostic Misconceptions - Nervous System
5.3Hormonal Coordination in Humans
5.3.1Endocrine Glands5.3.2The Endocrine System5.3.3Thyroxine5.3.4Adrenaline5.3.5Blood Glucose5.3.6Detecting Glucose5.3.7Diabetes5.3.8Type 1 Diabetes5.3.9Type 2 Diabetes5.3.10Water Balance5.3.11Kidneys5.3.12Urea5.3.13Urine Production5.3.14Urine5.3.15Dialysis5.3.16Dialysis - Pros & Cons5.3.17Transplants5.3.18Transplants - Pros & Cons5.3.19Puberty5.3.20Menstruation5.3.21Menstrual Hormones5.3.22Menstrual Cycle5.3.23Contraception - 'Natural Methods'5.3.24Contraception - Sterilisation5.3.25Contraception - Condoms5.3.26Contraception - The Pill5.3.27Contraception - Diaphragm & IUDs5.3.28Contraception - Other Options5.3.29Hormones for Infertility5.3.30In Vitro Fertilisation5.3.31Fertility Treatments - Pros & Cons5.3.32End of Topic Test - Homeostasis & Hormones5.3.33Grade 9 - Hormonal Coordination5.3.34Exam-Style Questions - Hormones & Contraception
6Inheritance, Variation & Evolution
6.1Reproduction
6.1.1Cell Division6.1.2Meiosis6.1.3Sexual Reproduction6.1.4Asexual Reproduction6.1.5Sexual Reproduction Advantages6.1.6Asexual Reproduction Advantages6.1.7Genome6.1.8Genome - Diagram6.1.9Genome Sequencing6.1.10Nucleotide6.1.11DNA Structure6.1.12Protein Synthesis6.1.13Protein Synthesis 26.1.14Mutations6.1.15Alleles6.1.16Genotype vs Phenotype6.1.17Punnett Squares6.1.18Punnett Squares 26.1.19Inherited Disorders6.1.20Cystic Fibrosis Punnett Square6.1.21Family Trees6.1.22Polydactyly6.1.23Genetic Crosses - Calculations6.1.24Genome Screening6.1.25Disadvantages of Embryonic Screening6.1.26Sex Determination6.1.27End of Topic Test - Reproduction6.1.28Exam-Style Questions - DNA & Genetics6.1.29Diagnostic Misconceptions - Mutations6.1.30Diagnostic Misconceptions - Chromosomes6.1.31Diagnostic Misconceptions - Genes & Alleles
6.2Variation & Evolution
6.2.1Variation6.2.2Evolution & Speciation6.2.3Natural Selection6.2.4Selective Breeding6.2.5Selective Breeding 26.2.6Uses of Selective Breeding6.2.7Dangers of Selective Breeding6.2.8Genetic Engineering6.2.9Genetic Engineering 26.2.10Uses of Genetic Modification6.2.11Advantages of Genetic Modification6.2.12Disadvantages of Genetic Modification6.2.13Cloning6.2.14Cloning Plants6.2.15Cloning Animals6.2.16Adult Cell Cloning6.2.17End of Topic Test - Variation & Evolution6.2.18Exam-Style Questions - Selective Breeding
6.3Genetics & Evolution
6.3.1Natural Selection6.3.2Controversy Around Natural Selection6.3.3Darwin's Theory of Evolution6.3.4Inheritance Theory6.3.5Speciation6.3.6Alfred Russel Wallace6.3.7Evidence for Evolution6.3.8Fossils6.3.9Resistant Bacteria6.3.10Genetics6.3.11Extinctions6.3.12Grade 9 - Evolution6.3.13Diagnostic Misconceptions - Natural Selection
7Ecology
7.1Adaptations & Interdependence
7.2Organisation of Ecosystems
7.2.1Population Dynamics7.2.2Predator-Prey Graphs7.2.3Impact of Environmental Change7.2.4Causes of Environmental Change7.2.5Assessing Ecosystems7.2.6Organism Abundance7.2.7Required Practical - Population Size7.2.8Assessing Ecosystems - Calculations7.2.9The Carbon Cycle7.2.10The Water Cycle7.2.11The Cycling of Materials7.2.12Decay7.2.13Anaerobic Decay7.2.14Biogas Generators7.2.15Required Practical - Decay7.2.16End of Topic Test - Organisation of Ecosystems7.2.17Grade 9 - Ecosystems7.2.18Exam-Style Questions - Decomposition
7.3Biodiversity
7.4Trophic Levels
7.4.1Trophic Levels7.4.2Trophic Levels: Food Chains7.4.3Trophic Levels: Decomposers7.4.4Pyramids of Biomass7.4.5Transfer Efficiency7.4.6Reasons for Energy Wastage7.4.7Transfer Efficiency - Calculations7.4.8Premium Knowledge - Trophic Levels & Food Chains7.4.9Exam-Style Questions - Food Chains7.4.10Diagnostic Misconceptions - Arrows
Jump to other topics
1Cell Biology
1.1What's in Cells?
1.1.1Types of Cells1.1.2Properties of Prokaryotes1.1.3Orders of Magnitude1.1.4Standard Form1.1.5Standard Form - Calculations1.1.6Addition in Standard Form - Calculations1.1.7Subtraction in Standard Form - Calculations1.1.8Multiplication in Standard Form - Calculations1.1.9Division in Standard Form - Calculations1.1.10Animal Cells1.1.11Plant Cells1.1.12Differentiation in Plants & Animals1.1.13Bacterial Cells1.1.14Types of Cells HyperLearning1.1.15Cell Specialisation in Animals1.1.16Sperm Cells1.1.17Nerve Cells1.1.18Muscle Cells1.1.19Cell Specialisation in Plants - Root Hair Cells1.1.20Cell Specialisation in Plants - Xylem1.1.21Cell Specialisation in Plants - Phloem1.1.22Microscopy1.1.23Magnification1.1.24Developments in Microscopy1.1.25Required Practical - Microscopy1.1.26Microscopy - Calculations1.1.27Culturing Microorganisms1.1.28Contamination1.1.29Avoiding Contamination1.1.30Calculating Bacteria1.1.31Calculating Bacteria - Calculations1.1.32Required Practical - Bacteria1.1.33Exam-Style Questions - Cell Structure & Microscopy1.1.34Diagnostic Misconceptions - Converting1.1.35Diagnostic Misconceptions - Animal Cells1.1.36Diagnostic Misconceptions - Mitochondria1.1.37End of Topic Test - What's in Cells?
1.2Cell Division
1.3Transport in Cells
1.3.1Diffusion1.3.2Factors Affecting Diffusion1.3.3Surface Area : Volume1.3.4Surface Area : Volume - Calculations1.3.5Exchange Surfaces1.3.6Examples of Exchange Surfaces1.3.7Osmosis1.3.8Osmosis 21.3.9Required Practical - Osmosis in Plant Tissue1.3.10Active Transport1.3.11Transport in Cells1.3.12Grade 9 - Cell Transport1.3.13Diagnostic Misconceptions - Water Moving1.3.14Diagnostic Misconceptions - Active Transport1.3.15End of Topic Test - Cell Division & Transport
2Organisation
2.1Principles of Organisation
2.2Enzymes
2.2.1Enzymes2.2.2Enzymes HyperFlashcards2.2.3Rate of Reaction2.2.4Calculating Rate of Reaction2.2.5Rate of Reaction - Calculations2.2.6Digestion2.2.7Bile2.2.8Examples of Digestive Enzymes - Amylase2.2.9Examples of Digestive Enzymes - Protease2.2.10Examples of Digestive Enzymes - Lipase2.2.11Testing for Biological Molecules2.2.12Required Practical - Testing for Food Chemicals2.2.13Required Practical - Enzymes2.2.14Grade 9 - Enzymes2.2.15Exam-Style Questions - Enzymes2.2.16Diagnostic Misconceptions - High Temperatures2.2.17Diagnostic Misconceptions - Low Temperatures2.2.18Diagnostic Misconceptions - Stomach Acid2.2.19Diagnostic Misconceptions - Substrate Shape2.2.20End of Topic Test - Organisation & Enzymes
2.3Circulatory System
2.3.1Types of Blood Vessels2.3.2Blood Vessels - Arteries2.3.3Blood Vessels - Capillaries2.3.4Blood Vessels - Veins2.3.5The Heart - Structure2.3.6The Heart - Function2.3.7Important Blood Vessels2.3.8Double Circulatory System2.3.9Gas Exchange2.3.10Gas Exchange - Calculations2.3.11Alveoli2.3.12Blood Components2.3.13Platelets2.3.14Red Blood Cells2.3.15White Blood Cells2.3.16End of Topic Test - Circulatory System
2.4Non-Communicable Diseases
2.4.1Health Issues2.4.2Disease Interactions2.4.3Sampling2.4.4Sampling - Calculations2.4.5Risk Factors2.4.6Examples of Risk Factors2.4.7Risk Factor Graphs2.4.8Coronary Heart Disease2.4.9Heart Valve Disease2.4.10Heart Failure2.4.11Treating Heart Disease2.4.12Comparing Treatments of Heart Disease2.4.13Cancer2.4.14Cancer Risk Factors2.4.15End of Topic Test - Non-Communicable Diseases2.4.16Exam-Style Questions - Coronary Heart Disease
2.5Plant Tissues, Organs & Systems
2.5.1Plant Organs2.5.2Leaves2.5.3Transpiration2.5.4Rate of Transpiration2.5.5Measuring Transpiration2.5.6Translocation2.5.7Transpiration Tissues - Xylem Cells2.5.8Transpiration Tissues - Root Hair Cells2.5.9Stomata2.5.10States of Stomata2.5.11Premium Knowledge - Transpiration2.5.12End of Topic Test - Plants2.5.13Exam-Style Questions - Plant Tissues2.5.14Diagnostic Misconceptions - Plant Food2.5.15Diagnostic Misconceptions - Plants & Water2.5.16Diagnostic Misconceptions - Plants Don't Breathe
3Infection & Response
3.1Communicable Disease
3.1.1Spreading Disease3.1.2Causing Diseases3.1.3Preventing Infection3.1.4Communicable Disease - Viruses3.1.5Examples of Viruses3.1.6Communicable Disease - Bacteria3.1.7Communicable Disease - Fungi3.1.8Communicable Disease - Protists3.1.9Human Defence Systems - Non-Specific Defences3.1.10Human Defence Systems - Immune Systems3.1.11Antibodies3.1.12Vaccinations3.1.13The Immune System3.1.14The Immune System 23.1.15Antibiotics3.1.16Antibiotic Resistance3.1.17Antibiotic Resistance 23.1.18Drug Discovery3.1.19Developing New Drugs3.1.20Drug Testing3.1.21Drug Testing in Laboratories3.1.22Double-Blind Trials3.1.23Drug Testing / Efficacy - Calculations3.1.24End of Topic Test - Communicable Diseases3.1.25Exam-Style Questions - Microorganisms & Disease3.1.26Diagnostic Misconceptions - Antibiotics
3.2Monoclonal Antibodies
4Bioenergetics
4.1Photosynthesis
4.1.1Photosynthesis4.1.2Photosynthesis Equation4.1.3Rate of Photosynthesis4.1.4Limiting Factors4.1.5Photosynthesis in Farming4.1.6Uses of Glucose4.1.7Photosynthesis - Calculations4.1.8Required Practical - Light Intensity4.1.9Grade 9 - Photosynthesis Experiment4.1.10Exam-Style Questions - Rate of Photosynthesis4.1.11Diagnostic Misconceptions - Photosynthesis4.1.12Diagnostic Misconceptions - Plants Respiration
5Homeostasis & Response
5.1Homeostasis
5.2The Human Nervous System
5.2.1The Nervous System5.2.2The Nervous System HyperFlashcards5.2.3Synapses5.2.4Reflexes5.2.5Components of a Reflex Arc5.2.6Required Practical - Human Reaction Times5.2.7The Brain5.2.8Parts of the Brain5.2.9The Brain: Neuro Techniques5.2.10Retina Scanning5.2.11Eye Anatomy5.2.12Eye Function - Focus5.2.13Eye Function - Light5.2.14Eye Defects5.2.15Thermoregulation5.2.16Hot & Cold5.2.17Thermoregulation - Sweating & Shivering5.2.18Thermoregulation - Body Hair5.2.19Thermoregulation - Blood Vessels5.2.20Body Temperature HyperLearning5.2.21End of Topic Test - Human Nervous System5.2.22Exam-Style Questions - Nervous System5.2.23Diagnostic Misconceptions - Nervous System
5.3Hormonal Coordination in Humans
5.3.1Endocrine Glands5.3.2The Endocrine System5.3.3Thyroxine5.3.4Adrenaline5.3.5Blood Glucose5.3.6Detecting Glucose5.3.7Diabetes5.3.8Type 1 Diabetes5.3.9Type 2 Diabetes5.3.10Water Balance5.3.11Kidneys5.3.12Urea5.3.13Urine Production5.3.14Urine5.3.15Dialysis5.3.16Dialysis - Pros & Cons5.3.17Transplants5.3.18Transplants - Pros & Cons5.3.19Puberty5.3.20Menstruation5.3.21Menstrual Hormones5.3.22Menstrual Cycle5.3.23Contraception - 'Natural Methods'5.3.24Contraception - Sterilisation5.3.25Contraception - Condoms5.3.26Contraception - The Pill5.3.27Contraception - Diaphragm & IUDs5.3.28Contraception - Other Options5.3.29Hormones for Infertility5.3.30In Vitro Fertilisation5.3.31Fertility Treatments - Pros & Cons5.3.32End of Topic Test - Homeostasis & Hormones5.3.33Grade 9 - Hormonal Coordination5.3.34Exam-Style Questions - Hormones & Contraception
6Inheritance, Variation & Evolution
6.1Reproduction
6.1.1Cell Division6.1.2Meiosis6.1.3Sexual Reproduction6.1.4Asexual Reproduction6.1.5Sexual Reproduction Advantages6.1.6Asexual Reproduction Advantages6.1.7Genome6.1.8Genome - Diagram6.1.9Genome Sequencing6.1.10Nucleotide6.1.11DNA Structure6.1.12Protein Synthesis6.1.13Protein Synthesis 26.1.14Mutations6.1.15Alleles6.1.16Genotype vs Phenotype6.1.17Punnett Squares6.1.18Punnett Squares 26.1.19Inherited Disorders6.1.20Cystic Fibrosis Punnett Square6.1.21Family Trees6.1.22Polydactyly6.1.23Genetic Crosses - Calculations6.1.24Genome Screening6.1.25Disadvantages of Embryonic Screening6.1.26Sex Determination6.1.27End of Topic Test - Reproduction6.1.28Exam-Style Questions - DNA & Genetics6.1.29Diagnostic Misconceptions - Mutations6.1.30Diagnostic Misconceptions - Chromosomes6.1.31Diagnostic Misconceptions - Genes & Alleles
6.2Variation & Evolution
6.2.1Variation6.2.2Evolution & Speciation6.2.3Natural Selection6.2.4Selective Breeding6.2.5Selective Breeding 26.2.6Uses of Selective Breeding6.2.7Dangers of Selective Breeding6.2.8Genetic Engineering6.2.9Genetic Engineering 26.2.10Uses of Genetic Modification6.2.11Advantages of Genetic Modification6.2.12Disadvantages of Genetic Modification6.2.13Cloning6.2.14Cloning Plants6.2.15Cloning Animals6.2.16Adult Cell Cloning6.2.17End of Topic Test - Variation & Evolution6.2.18Exam-Style Questions - Selective Breeding
6.3Genetics & Evolution
6.3.1Natural Selection6.3.2Controversy Around Natural Selection6.3.3Darwin's Theory of Evolution6.3.4Inheritance Theory6.3.5Speciation6.3.6Alfred Russel Wallace6.3.7Evidence for Evolution6.3.8Fossils6.3.9Resistant Bacteria6.3.10Genetics6.3.11Extinctions6.3.12Grade 9 - Evolution6.3.13Diagnostic Misconceptions - Natural Selection
7Ecology
7.1Adaptations & Interdependence
7.2Organisation of Ecosystems
7.2.1Population Dynamics7.2.2Predator-Prey Graphs7.2.3Impact of Environmental Change7.2.4Causes of Environmental Change7.2.5Assessing Ecosystems7.2.6Organism Abundance7.2.7Required Practical - Population Size7.2.8Assessing Ecosystems - Calculations7.2.9The Carbon Cycle7.2.10The Water Cycle7.2.11The Cycling of Materials7.2.12Decay7.2.13Anaerobic Decay7.2.14Biogas Generators7.2.15Required Practical - Decay7.2.16End of Topic Test - Organisation of Ecosystems7.2.17Grade 9 - Ecosystems7.2.18Exam-Style Questions - Decomposition
7.3Biodiversity
7.4Trophic Levels
7.4.1Trophic Levels7.4.2Trophic Levels: Food Chains7.4.3Trophic Levels: Decomposers7.4.4Pyramids of Biomass7.4.5Transfer Efficiency7.4.6Reasons for Energy Wastage7.4.7Transfer Efficiency - Calculations7.4.8Premium Knowledge - Trophic Levels & Food Chains7.4.9Exam-Style Questions - Food Chains7.4.10Diagnostic Misconceptions - Arrows
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