Why do sperm cells contain large numbers of mitochondria?

cause they need to have that much energy to get to the female egg

the bullets go in this order.

4, 1, 3, 5, 2

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.