Question

which of the following is the purpose of protonephridia? a. excretion b. digestion c. respiration d. movement

Explanation:

Protonephridia are excretory structures found in certain invertebrates. Their main function is to remove waste products from the body, which is the process of excretion. Digestion involves breaking down food, respiration is related to gas exchange, and movement is about locomotion. None of these other functions match the role of protonephridia.

Answer:

A. excretion