They are renewable natural resources. They move round and round in cycles and never run out. For example a horse eats a plant the horse gets eating by another animal the cycle goes on an on an on
I believe reducing our co2 emmisions would reduce wave erosion because the sea level would lower, meaning waves wouldnt getas far or high as they do now.
First option - 1
Second option - 4
Third option - 5
Fourth option - 2
Fith option - 3
Hope it helped,
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A. provides the energy needed to maintain physical activity for long periods of time. Sorry if it's wrong.