Answer:
<u><em>Ancestors</em></u>
Explanation:
Ancestors can be described as the persons from which a particular human being originated. In a broader perspective, it is referred to family history of a person. Scientists believe that all organisms on Earth originated from a common ancestor which were the prokaryotes. The prokaryotes with time gave rise to the eukaryotes. Common descent is the phenomenon in which organisms having common ancestors are referred.
Kinetic energy is the energy that an object has because of its motion.
If there where a decrease in the number of decomposers there would be a increase in the number of producers and consumers.
A gene is a variant of an allele.chromosomes have the same genes, but might have different versions of those genes. The different possible versions of the genes are called alleles.
