In the first step of spermatogenesis, spermatogonia differentiate cells into
a. spermatids
b. primary spermatocytes
c. secondary spermatocytes
d. spermatozoa
e. spermatophyte

B. Primary spermatocytes

Explanation:

The germ cell line is a group of cells found inside the seminiferous tubules. This germ cells undergo mitosis (creating spermatogonia) to have a steady supply of cells that will divide by meiosis to produce gametes. When spermatogonia divide by meiosis at the end of meiosis I the newly created cells are known as primary spermatocytes.

b

is correct hope this   also i learnd this in middle school

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.