In single traits, natural selection can lead to which of the following?

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f