The transfer of nitrogen from the atmosphere to the soil, to living things, and back to the atmosphere is... a
The water cycle
b
evaporation
c
The Nitrogen Cycle
d
Denitrification

How do ecosystem respond to nature disasters such as fires and floods

Why is excretion necessary to maintain homeostasis?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons