What are the causes of substance abuse?

Suppose both parents Can roll their tongue's but their son cannot. Draw a pedigree showing this trait, and label each symbol with the appropriate genotype

Explain one mechanism that eukaryotic organisms is to regulate genes.

Which of the following is responsible for the exchange of gases in a leaf? a. the phloem b. the spongy c. mesophyll d. the stomata

Organisms that feed on dead decaying matter are called?

What is the most likely explanation for the DNA found in mitochondria? A. Mitochondria was once a prokaryotic organism. B. Mitochondria was once a eukaryotic organism. C. Mitochondria was once a primkaryotic organism.

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: