Which of the following is true of spermatogenesis?
a. occurs before puberty
b. involves the differentiation of spermatids leading to the formation of mature spermatozoa
c. the process of spermatozoa production
d. results in the production of primary spermatocytes
e. involves the production and secretion of testosterone

The correct answer is c. the process of spermatozoa production

Explanation:

Spermatogenesis is the process of formation of sperms in the seminiferous tubules present in the testes. The process of spermatogenesis starts when germ cells present in the seminiferous tubule starts dividing mitotically.

Some of these cells become primary spermatocytes after mitosis and enters meiosis I. After completion of meiosis I they become secondary spermatocytes.

Each secondary spermatocytes converts into two haploid spermatids after completion of meiosis II. Spermatids then differentiate into mature sperms called spermatozoa.

Thus, the correct answer is c.  the process of spermatozoa production

they float because they are less dense than the water itself

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.