Birds are and have a heart.

a. endothermic; three
b. endothermic; four
c. ectothermic; three
d. ectothermic; four

Could someone me with number one you

If a cell is placed into a hypertonic environment,what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge

The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.