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Module 3: Biodiversity and Evolution
2.3.3 Evolution
(a) define the term variation
Variation is the presence of differences between individuals. This can be within a species or between species.

(b) discuss the fact that variation occurs within as well as between species
The variation that occurs between species is usually…

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Module 3: Biodiversity and Evolution
Genetic variation and environmental variation are linked. In the past century, humans have become taller as a
result of a better diet. But however good a diet you have, you are unlikely to grow very tall if all the rest of your
family are short.…

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Module 3: Biodiversity and Evolution

As all of the offspring are different, some may be better adapted than others. The better adapted individuals
obtain enough food and survive long enough to reproduce, passing on their characteristics to the next
generation. The less well adapted individuals are likely to die before…

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Module 3: Biodiversity and Evolution

(i) outline how variation, adaptation and selection are major components of evolution

(j) discuss why the evolution of pesticide resistance in insects and drug resistance in microorganisms has
implications for humans
1. There is genetic variation is a population of bacteria/plants as mutation has occurred…


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