Adult sponges produce eggs and sperm, and an adult is mature, fully developed. Given these facts, what produces both eggs and sperm among the following options:
- Plant reproduction
 - sub-units of species
 - gastropod shells
 - an individual mature sponge
 - Microscopic organisms
 - members of their own species
 - peachleaf willow
 - seed dispersal


 

    an individual mature sponge     