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

Passage: Producers are living things that use energy to make food. Producers make food for themselves and other living things. There are two types of producers:. Answer: producers
Living things that use energy to make food, both for themselves and other living things, are what part of an ecosystem?

Passage: The Gaia hypothesis states that the biosphere is its own living organism. Answer: the gaia hypothesis
What hypothesis states that the biosphere is its own living organism

Passage: Maturation of the ovum. Notice only 1 mature ovum, or egg, forms during meiosis from the primary oocyte. Three polar bodies may form during oogenesis. These polar bodies will not form mature gametes. Conversely, four haploid spermatids form during meiosis from the primary spermatocyte. Answer: the primary spermatocyte
Four haploid spermatids form during meiosis from what?