Question

cnidaria - shape of life
how do cnidarian cells communicate?
○ pheromones
○ sound waves
○ electrical impulses
○ chemical messages

Explanation:

Cnidarians lack a central nervous system. Their cells communicate through electrical impulses that spread across the nerve net. Pheromones are mainly for chemical signaling in some animals for things like mating (not the main cell - communication in cnidarians). Sound waves are not a common mode of cell - to - cell communication in simple organisms like cnidarians. While chemical messages (in a broader sense, but not the typical form here) exist in many organisms, electrical impulses are key for cnidarian cell communication as they help in coordinating simple responses like capturing prey or avoiding predators.

Answer:

Electrical impulses