The adaptive advantage of producing sperm in a system of tubes

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During gametogenesis, a sperm cell undergoes considerable structural change. How do the sperm features relate to function?

What is the adaptive advantage of producing sperm in a system of tubes rather than in solid tissue?

How would retaining extra cytoplasm enhance the survival of a developing oocyte?

What are the relative sizes of oocytes in a dormant follicle, a growing follicle, and a Graafian follicle?