The calm areas near the equator where warm air rises

a. horse latitudes
b. trade winds
c. doldrums
d. polar easterlies

Which are forms of nitrogen that are usable by humans

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins