The membrane of the nucleus helps a cell perform which function? A Keep genetic material in one place
B Store energy
C Store water
D Protect against microbial infection

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

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?