Given a scientific passage and an answer, generate a question for the given answer.

Passage: Sponges reproduce both asexually and sexually. Asexual reproduction occurs by budding. Sexual reproduction occurs by the production of eggs and sperm. Males release sperm into the water through the osculum. Sperm may enter a female sponge through a pore and fertilize her eggs. The resulting zygotes develop into larvae. Answer: asexual
Budding in sponges is a form of what type of reproduction?

Passage: Sperm ( Figure below ), the male reproductive cells, are tiny. In fact, they are the smallest cells in the human body. What do you think a sperm cell looks like? Some people think that it looks like a tadpole. Do you agree?. Answer: sperm
What are the male reproductive cells called?

Passage: Infiltration is the process by which water soaks into the ground. Some of the water may seep deep underground. Some may stay in the soil, where plants can absorb it with their roots. Answer: infiltration
Water seeping into the ground is known as?