Which structures contain valves?

a. arteries and veins
b. arteries and heart
c. arteries, capillaries, and heart
d. lymph capillaries, arteries, and heart
e. lymph capillaries, veins, and heart


ANSWER: e

Biology & Microbiology

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Which biome occurs in the interiors of continents where winters are cold and snowy and summers are warm and fairly

dry?

a. tropical montane forests b. temperate grasslands c. chaparral d. dry savannas e. temperate forests

Biology & Microbiology

Diffusion ________ the entropy of a solution.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Succession happens because species in the habitat alter that habitat in ways that assist other species. There are three dynamic concepts that are of critical importance for succession to take place. They are  

A.  establishment, facilitation, and inhibition. B.  symbiotic relationships, facilitation, and aposematic coloration. C.  establishment, coevolution, and competitive exclusion. D.  competition, climax communities, and tolerance. E.  competition, inhibition, and coevolution.

Biology & Microbiology

Inbreeding depression, the reduction in fitness of inbred organisms, often results from the reduced level of what (within the gene pool)?

What will be an ideal response?

Biology & Microbiology