What substance cannot be broken down into other substances

The majority of non-mammalian or non-avian animals are ectotherms and rely on the environment as their heat source. Which of the following are ectotherms? (check all that apply). a. Western fence lizardb. Xenopus (African clawed frog) c. Fruit Flyd.

Wut do idk mean no one will tell me because they said I'm not a teen

What were forensic scientists in the U. K. able to learn through isotopic analysis?

Fish have what type of circulatory system? A.) single loop B.) double loop C.) triple loop D.) quadruple loop

What is the large gland which extends into the neck and partially covers the heart.

How do cancer cells behave differently from healthy cells?

Explain why living organisms contain more hydrogen atoms than any other atoms

At end of telophase, what must occur

Which of the following is NOT true about spongy bone? A. It is less dencse than compact bone. B. It is organized into structures that resemble a bridge's supporting girders. C. It is soft and spongy. D. It adds strength to bone without adding mass.

Months after last taking a drug, a former drug abuser still produces very little serotonin. the person is depressed and anxious and has great difficulty remembering new material. most likely, the abused drug-if it was a single drug-was: