<span>Decomposition reaction is where an organism undergoes breakdown into simpler molecules and compounds. This is caused by other biotic and abiotic factors in the environment. Simply, decomposition is part of a cycle where a complex compound is breakdown and used again for complex reconstruction of other organic processes. </span>
A) Crossing over is the mechanism of genetic variation that results from the exchange of gene segments between non-sister chomatids.
Bacteria decomposes other things.
