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Biology Unit 4
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Topic 5: On the wild side
10. Explain that the numbers and distribution of
organisms in a habitat are controlled by biotic and
abiotic factors.
Abiotic factors
Abiotic factors are the non-living elements of the habitat of an organism. They include:

The amount of…

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Biology Unit 4
Revision Notes

Biotic factors
Biotic factors are the living elements of a habitat which affect the availability of a group of
organisms to survive there. They include:

The populations of prey and predator will oscillate in a repeating cycle
As a prey population increases there is…


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