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

[Q]: Passage: Diagram of a typical prokaryotic cell. Among other things, prokaryotic cells have a plasma membrane, cytoplasm, ribosomes, and DNA. Prokaryotes do not have membrane-bound organelles or a cell nucleus. Answer: not membrane-bound
[A]: What are unique about prokaryotic cells' organelles?

[Q]: 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
[A]: What are the male reproductive cells called?

[Q]: Passage: Not all climate regions develop soils. Arid regions are poor at soil development. Not all regions develop the same soil horizons. Some areas develop as many as five or six distinct layers. Others develop only a few. Answer: soil
[A]:
While some climate regions have multiple layers, arid regions are poor for development of what?