CIE IGCSE Biology: 复习笔记：20.1.1 Ensuring Food Supply
CIE IGCSE Biology: 复习笔记：20.1.1 Ensuring Food Supply Intensive Food Production Making food production more intensive means producing food more efficiently with a finite amount of land an...
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CIE IGCSE Biology: 复习笔记：19.1.6 Populations
CIE IGCSE Biology: 复习笔记：19.1.6 Populations Definition of Population A population is defined as a group of organisms of one species, living in the same area at the same time Other important def...
CIE IGCSE Biology: 复习笔记：19.1.5 Nutrient Cycles
CIE IGCSE Biology: 复习笔记：19.1.5 Nutrient Cycles The Carbon Cycle Nutrients such as carbon and nitrogen are not endless resources There is a finite amount of each element on the planet an...
CIE IGCSE Biology: 复习笔记：19.1.4 Pyramids of Energy: Extended
CIE IGCSE Biology: 复习笔记：19.1.4 Pyramids of Energy: Extended Pyramids of Energy: Extended In order for the energy to be passed on, it has to be consumed (eaten) However not all of the en...
CIE IGCSE Biology: 复习笔记：19.1.3 Pyramids of Number & Biomass
CIE IGCSE Biology: 复习笔记：19.1.3 Pyramids of Number & Biomass Pyramids of Number A pyramid of numbers shows how many organisms we are talking about at each level of a food chain. The ...
CIE IGCSE Biology: 复习笔记：19.1.2 Food Chains & Food Webs
CIE IGCSE Biology: 复习笔记：19.1.2 Food Chains & Food Webs Food Chains & Food Webs A food chain with three trophic levels A food chain shows the transfer of energy from one o...
CIE IGCSE Biology: 复习笔记：19.1.1 Transfer of Energy
CIE IGCSE Biology: 复习笔记：19.1.1 Transfer of Energy Transfer of Energy Transfer of Energy The Sun is the principal source of energy input to biological systems Energy flows through living organi...
CIE IGCSE Biology: 复习笔记：18.1.5 Artificial Selection
CIE IGCSE Biology: 复习笔记：18.1.5 Artificial Selection Selective Breeding Selective breeding means to select individuals with desirable characteristics and breed them together The p...
CIE IGCSE Biology: 复习笔记：18.1.4 Natural Selection
CIE IGCSE Biology: 复习笔记：18.1.4 Natural Selection Natural Selection In any environment, the individuals that have the best adaptive features are the ones most likely to survive and repro...
