Answer:
it addresses Loss of Biodiversity
Explanation:
if you read the question you find a key word which is decrease
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By it alleles, and there genes what one plant have the other may not have see it all depends on the out come of the alleles-genes that they come up with .
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The control is the group of no fertilizers.
A control in an experiment is usually the group without the variable to be tested. In this case, the farmer wanted to test the effects of fertilizers, therofre the group without it is the control group.
The answer for Part A is: In an action-reaction pair the forces work on different objects.