succession occurs in areas where there is already soil, but the plants
and animal life there has been wiped out.
A)Secondary
B)Primary
C)Annual
D)All of these

A. Secondary

Explanation:

The description the question gives is where there is soil, but all plants and animals lives have been cut out. This fits the secondary succession.

Primary succession is immediately wrong because it is when the environment is lacking soil, which is not what the question is asking. And since Primary is incorrect, this also means D. All of these is incorrect as well. Annual already has plant life

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme