Which of the following requires the aid of transport proteins in a cell membrane.,and why

Which of these would most likely be a stimulus that would cause the body to initiate feedback mechanisms a.) normal body temperature in an arctic environment b.) normal boy temperature in a tropical environment c.)light physical activity d.)low blood sugar

Which of the following locations would most likely have the most wind erosion?

If a dna molecule has 100 nucleotides and 22 of them are cytosine, how many thymines does it have?