Which of the choices below is the salt level-monitoring part of the nephron?

a. loop of Henle

b. principal cell

c. macula densa

d. vasa recta

What happens as a river gets older? A. Its stream gradient increases. B. Its floodplain widens. C. Its water flows faster. D. Its suspended load contains bigger rocks.

How do organisms contribute to the carbon cycle

Which of the following would be the most effective means of controlling current water pollution of US surface water?

The majority of alcohol is excreted through exhalation of air in the lungs. a. True b. False

8. Identify the genotypes and phenotypes of the offspring from each of the following crosses. Use T as the dominant trait and t as the recessive trait. a. Heterozygous parent x heterozygous parent b.

True or false some digestion occurs in the esophagus

Compared to a medical researcher, a family doctor is more concerned with?

Explain how the use of oil as an energy source can potentially affect aquatic viability.

Why plants don't need specialized rispiratory system?

4. One of the jobs of the endocrine system is to give directions to your body about when to grow and develop. Can you think of some times during a person's life when the body changes? Avita