Which description is correct for both oogenesis and spermatogenesis?

a. The cells have 46 chromosomes until meiosis Il is completed.
b. After meiosis I, the cells have 23 chromosomes.
c. Part of meiosis l is completed before birth.
d. The entire process takes about 70 days.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms