7. the following factual information:
a) the factors which affect the distribution of organisms vary according to the time of day and the time of year
b) in a food chain A->B->C means that B eats A and C eats B
c) food chains begin with green plants which provide food for other organisms
d) natural organic materials decay because they are broken down by microbes
e) many manufactured materials such as polythene do not decay
f) humans reduce the amount of land available for other plants and animals e.g. by building quarrying farming dumping waste
g) humans pollute the environment e.g. water with sewage air with smoke land with poisonous chemicals.
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