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Edexcel IGCSE Biology 复习笔记 4.2.3 Food Pyramids & Transfer of Energy Food Pyramids A pyramid of numbers shows how many organisms we are talking about at each level of a food chain. Th...
Edexcel IGCSE Biology 复习笔记 4.2.2 Food Webs Food Webs A food web is a network of interconnected food chains Food webs are more realistic ways of showing connections between organisms with...
Edexcel IGCSE Biology 复习笔记 4.2.1 Trophic Levels & Food Chains Trophic Levels & Food Chains Trophic levels Trophic levels are used to describe the feeding relationships between or...
Edexcel IGCSE Biology 复习笔记 4.1.4 Abiotic & Biotic Factors Abiotic & Biotic Factors In Biology, ‘abiotic’ means non-living An abiotic factor is a non-living factor within an envir...
Edexcel IGCSE Biology 复习笔记 4.1.3 Biodiversity Biodiversity Biodiversity is the range and variety of different species of organisms on Earth, or within an ecosystem It considers not only ...
Edexcel IGCSE Biology 复习笔记 4.1.2 Practical: Investigating Population Size Practical: Investigating Population Size Ecology is the branch of biology that studies: The distribution ...
Edexcel IGCSE Biology 复习笔记 4.1.1 Key Terms in Ecology Key Terms in Ecology There are several key terms that we use when referring to the various different components of an ecosystem and ...
Edexcel IGCSE Biology 复习笔记 3.2.8 Natural Selection Darwin's Theory of Evolution by Natural Selection Charles Darwin proposed the theory of evolution by natural selection He came up with this th...
Edexcel IGCSE Biology 复习笔记 3.2.7 Mutation Mutations Mutations are rare, random changes that occur in the sequence of DNA bases in a gene or a chromosome Mutations occur continuously As t...
