Why are the tropics the most diverse areas?

a. they have the most nonnative species.

b. they have many secondary disturbances.

c. they have no predators.

d. they have stable temperatures?

State the importance of the following responses: (a) Chemo-taxis in pollen grains (b) Positive rheotaxis in butterfly (c) Positive aerotaxis to aerobic bacteria.

Which best describe fetus development? A. The heart beats and is heard during the first trimester. B. The heart beats and is heard during the second trimester. C. The heart beats during the first trimester, but is heard in the second trimester. D.

What differentiates anthropocentric and biocentric views of the environment?

The part of the small intestine most likely to develop an ulcer from exposure to gastric juice is the

Cystic fibrosis is an autosomal recessive disorder that affects lung function in humans. a man and a woman are both unaffected heterozygous carriers of a cystic fibrosis gene.

The idea that natural selection promotes an increase in positive mutations matches ___'s theory. a-Lamarck b-Darwin

A cross section of a tree bunk shows 20 dark colored rings and 20 light colored rings what is the likely age of this tree

What side of the body is your appendix on?

Which principle was used to gather evidence that led to the big bang theory? A. Doppler shift B. radiocarbon dating C. first law of thermodynamics D. law of gravity

Ice ages can cause the extinction of animals because lack of