Adult sponges produce eggs and sperm.
Each ovule usually contains one egg , the female gamete or sex cell.
Adult sponges produce female gametes and sperm.
Adult sponges produce sperm and what other sex cell?

[A] testicles
[B] it needs them
[C] gastropod shells
[D] fertile
[E] testosterone
[F] zygotes
[G] female gametes
[H] barnacles