Which of the following is/are diploid cells? (SELECT ALL THAT APPLY)
a. spermatogonium
b. primary spermatocytes
c. spermatids
d. secondary spermatocytes

Appreciate if you can help, thanks.
Brainliest if correct.

Why are slow-twitch muscles more beneficial than fast-twitch muscles for cardiorespiratory fitness?

If babies are consistently placed on their backs without any restrictions, what will happen to their development? a. they suffer from weakness in certain muscle groups. b. their ability to roll over, crawl, and eventually walk is hindered. c. they suffer brain damage from the pressure on the back of the head. d. they learn to roll over, crawl, and eventually walk on their own.

The process by which the diameter of the bone increases is called? a-metaphysic b-appositional growth c-diaphysics d-epiphysis