The half-life of cobalt 60 is 5.3 years. What fraction of a sample remains after 21.2 years?

A.

one half

B.

one quarter

C.

one eighth

D.

one sixteenth

To conserve water, an animal's kidneys can pump ions across cell membranes, allowing water to move by

Describe a chemical indicator. What is it? What is it used for? How does it work? Answer:

How can silica content if molten material effect the color of igneous rocks

What is the most in danger from the effects of overfishing? A. Plankton that rely on stable ocean temperatures. B. Predators that eat fish to survive. C. Animals that are normally eaten by fish. D. Land animals that are near their carrying capacity.

What would you expect to happen to the number of high tides in any given area if the rate of Earth's rotation doubles?

A specific molecule was separated from a yeast cell and then placed in a flask to find out if it would bind to another molecule. This type of experimental design is called a (n) A. in vitro observation B. occupational cohort study C.

If one is experiencing difficulty sleeping, like with insomnia, he or she may go to their family doctor. What type of drug is the doctor most likely to prescribe to assist the person in falling asleep?

As you examine a soil sample under your microscope, you note the presence of tiny, worm-like organisms. You immediately suspect that these creatures are nematodes.

A proton gradient across the mitochondrial inner membrane is a requisite for the synthesis of ATP. What contributes to the creation of this proton gradient?

Peter has been seeing a counselor for problems in his sexual life. Peter's counselor referred him to an urologist to treat his problem.