Consider the following statements about thermoregulation in animals.
A. It uses external environment to regulate internal body temperature
B. It does not use external environment to regulate internal body temperature
C. It can vary internal temperature considerably
D. It can maintain thermal homeostasis in a narrow range of temperatures
Which one of the following options correctly describes a poikilothermic ectotherm?
1
A and D
2
B and C
3
A and C
4
B and D