Adult sperm are capable of producing sperm and what in order to be able to reproduce?\nOptions:\n- (A) Plants growth\n- (B) reproduce\n- (C) skin cells\n- (D) female gametes\n- (E) it needs them\n- (F) kinetic energy\n- (G) estrogen\n- (H) vaginas
Step-by-step reasoning:
(D)
Adult sponges produce eggs and sperm.

Female gametes are called eggs.

Adult sponges produce female gametes and sperm.

.

Final answer: (D)