Biology

The correct answer is: D.By using cytokines to send chemical signals.

Explanation:

Immune cells communicate primarily by releasing cytokines, which are small proteins that act as chemical signals. Cytokines help regulate and coordinate the immune response by allowing immune cells to communicate with one another. They influence immune cell activation, growth, differentiation, and migration to areas where immune responses are needed, such as infection sites or sites of inflammation.

The other options are incorrect because:

A.By releasing neurotransmitters: Neuro...