What do organisms from the ocean use the carbon dioxide for?
a. to breathe
b. to build bones
c. to make shells
d. to organisms decompose

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review