In natural selection, current conditions in the local environment determine which phenotypes are sucessful.
The mechanical and chemical receptors that control digestive activity are located in the walls of the tract organs.
It is crucial to study ocean microbes because THEY CONTROL THE MAJOR BIOGEOCHEMICAL CYCLES THAT KEEP EARTH'S BIOSPHERE IN BALANCE.
The ocean is made up of many microbes, which play important role in the process of biogeochemical cycling of various elements. For instance, microbes play very important role in the biogeochemical cycling of carbon and nitrogen. In the nitrogen cycle, the microbes are responsible for breaking down the protein molecules that are found in the body of dead plants and animals. The proteins are broken down into constituent amino acids, which are then released back into soils. The soil used these ammonia as sources of nitrogen for growing plants.
