Urban areas use more energy overall than rule areas mostly because so many more people live there however due to a higher level of energy efficiency in urban areas energy use per person is similar.

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

All other things being equal the size of a population will decrease if

Alaboratory investigation included examine prepared slides of pond water singled celled organisms with a nucleus and either cilia or flagella were visible these organism probably belong to the kingdom