What produces both eggs and sperm?\nOptions:\n- (A) Plant reproduction\n- (B) sub-units of species\n- (C) gastropod shells\n- (D) an individual mature sponge\n- (E) Microscopic organisms\n- (F) members of their own species\n- (G) peachleaf willow\n- (H) seed dispersal Think carefully first, then make a decision. My thoughts:
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Adult sponges produce eggs and sperm. An adult is mature, fully developed. Mature sponges produce eggs and sperm. So the answer is (D).
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