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...
Intro to Polar Coordinates What are polar coordinates? Polar coordinates?are an alternative way (to Cartesian coordinates) to describe the position of a point in 2D (or 3D) space In 2D, the positio...
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...
