When two different organisms exhibit a similarity in the pattern of embryological development, it is an indication that the two organisms have descended from a common ancestor. Similarity in embryological development is accepted by biologists as further evidence of common ancestry to back up evidence obtained from fossil finds.
A molecule is the smallest particle of a substance that exists independently.Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of twoatoms. ... A compound is a substance formed when two or more elementsare chemically joined.
Enzymes because they are the catalyst of the reaction process.