4. The thin, branched processes of a neuron, whose main function is to receive incoming signals, are called

A. terminals
B. cell bodies
C. axons
D. dendrites
E. synapses

D.

Explanation: Taking a look at the diagram it's super easy to see the branches on the near side of the cell, that reach out to other cells axons and their synapses.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

the answer is:

carbon dioxide