After the transfer of electrons, calcium becomes an ion with a charge of and oxygen becomes an ion with a charge of

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

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

Cells are adapted to preform specific functions. which of the following terms refers to this capability?