Which of the following is responsible for the deepening of the voice in males?
a. estrogen and progesterone
b. primary sex characteristics
c. reproduction
d. testosterone

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.