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

Community funding may suffer when a company receives a "?" which may mean less money to pay for public services.

Which of the following is an example of the geosphere interacting with the hydrosphere? Rain falls from clouds. Humans mine diamonds. Forest fires produce gases. Top soil is eroded by rain water.

Which organ produces estrogen and progesterone? testes ovaries uterus epididymis

Which of the following is a reason why cells divide? A. to maintain a surface area large enough to support their cytoplasm. B. to mutate their DNA. C. to increase the volume of their cytoplasm. D. to decrease their amount of RNA

Which part of the male reproductive system is a pouch that contains the testes

What would you expect to happen if sea otters were removed from this food web? Check all that apply. The population of elephant seals would decrease. The population of kelp crabs would increase. The population of kelp would increase.

When blockages in the bloodstream read the Brian it can cause blank?

A gazelle is born with slightly longer legs which allow it to run faster than the other gazelles in the herd. This adaptation came may have come about because a. the gazelle needed to be able to run faster. b.

In a population of deer mice, the allele for white hair is recessive and the allele for brown hair is dominant.

What makes a molecule a saturated fat?