A) Spermatogenesis involves meiosis; oogenesis involves mitosis.
B) Spermatogenesis produces fewer numbers of gametes.
C) Spermatogenesis begins at birth; oogenesis begins at puberty.
D) Spermatogenesis continues throughout life; oogenesis ends at menopause.

A) those living on mountains
B) those living in oceans
C) those living in forests
D) those living on prairies

A) before birth
B) when an egg is ovulated each month
C) only when the egg is fertilized
D) at the time of birth