PLEASE HELLPPP A newly identified animal was discovered. Scientists concluded that the animal is an ectotherm. Which of the following observations best supports this conclusion?

a. The animal's body temperature increased when the ambient temperature increased.
b. The animal's body temperature increased as its metabolic rate decreased.
c. The animal's body temperature measured during the day was 37°C, and at night it was 35°C.
d. The animal's metabolic rate decreased as the ambient temperature increased.