CIE IGCSE Biology: 復(fù)習(xí)筆記：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: 復(fù)習(xí)筆記：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: 復(fù)習(xí)筆記：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: 復(fù)習(xí)筆記：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: 復(fù)習(xí)筆記：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...
CIE IGCSE Biology: 復(fù)習(xí)筆記：18.1.3 Adaptive Features: Extended Hydrophytes & Xerophytes: Extended Hydrophytes Plants adapted to live in?extremely wet conditions Common adaptations include: Lar...
CIE IGCSE Biology: 復(fù)習(xí)筆記：18.1.2 Adaptive Features Adaptations & Fitness Adaptive features are the?inherited functional features of an organism that increase its fitness Fitness is th...
CIE IGCSE Biology: 復(fù)習(xí)筆記：18.1.1 Variation Types of Variation Variation is defined as?differences between individuals of the same species Phenotypic variation?is the difference in ...
CIE IGCSE Biology: 復(fù)習(xí)筆記：17.1.9 Codominance & Sex-Linked Characteristics: Extended Codominance: Extended Codominance Codominance occurs when?both alleles in heterozygous organisms contribut...
