Which term describes the system of continuous water movement on and in the earth?
a. precipitation cycle
b. erosion cycle
c. hydrologic cycle
d. vapor cycle

Precipitation cycle, water rains on earth, sun evaporates water, puddles, ponds, lakes, oceans, river. Clouds gather water. Repeat

Cells of an organism tell each other when predators are near.

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.