The combination of events associated with the origin, diversification, extinction , and interactions of organisms which produced the species that currently inhabit the Earth.
Macromolecules are polymers of monomers.
In ciliates, the large nucleus that carries up to several hundred copies of the genome and controls metabolism and asexual reproduction . Foods needed by animals daily or on a fairly regular basis. One of the bones comprising the middle ear of mammals. The mammal-like reptiles are thought to have been the reptile group from which the mammals later evolved. In mollusks, a membranous or muscular structure that surrounds the visceral mass and secretes a shell if one is present.