The oxygen gas (02) that most organisms find necessary for life is made up of two identical oxygen atoms covalently bonded to one another. Does 02 constitute a compound or a molecule? Explain.

In what for do plants utilize nitrogen? why do they need nitrogen?

Competition occurs between species when

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?