In a microbial community, autotrophs generate 1,000 calories per hour of gpp and 500 calories per hour of npp. primary consumers convert 60 calories per hour into their own biomass. what is the ecological efficiency in the link between autotrophs and primary consumers in this community?

the fossil record provides evidence of a common ancestor to many species.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.