Edexcel IGCSE Biology: Double Science 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 ...
Edexcel IGCSE Biology: Double Science 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 betwee...
Edexcel IGCSE Biology: Double Science 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 relation...
Edexcel IGCSE Biology: Double Science 复习笔记 Abiotic & Biotic Factors In Biology, ‘abiotic’ means non-living An abiotic factor is a non-living factor within an environment such as temperature...
Edexcel IGCSE Biology: Double Science 复习笔记 4.1.2 Practical: Investigating Population Size Practical: Investigating Population Size Ecology is the branch of biology that studies: T...
Edexcel IGCSE Biology: Double Science 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 a...
Edexcel IGCSE Biology: Double Science 复习笔记 3.2.7 Natural Selection Darwin's Theory of Evolution by Natural Selection Charles Darwin proposed the theory of evolution by natural sel...
Edexcel IGCSE Biology: Double Science 复习笔记 3.2.6 Mutation Mutations Mutations are rare, random changes that occur in the sequence of DNA bases in a gene or a chromosome Mutations occur c...
Edexcel IGCSE Biology: Double Science 复习笔记 Types of Variation Types of Variation Variation is defined as differences between individuals of the same species Variation can be divided into...
