The answer for this question is d, but why is a wrong and why is d correct?

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection