What's a unique property of retroviruses that makes them highly adaptive and potentially very devastating?
A. Retroviruses were discovered in the 1970s.
B. Retroviruses use RNA as their genetic material
C. Retroviruses can't replicate.
D. Retroviruses are viruses that travel backward in the cell.

B. Retroviruses use RNA as their genetic material. Correct

Explanation:

Penn Foster

Retroviruses use RNA, not DNA, as their genetic material; this way, the retrovirus can integrate its DNA into the DNA of the host cell so the retrovirus can continue to replicate.

the answer is tropical areas. the tropical areas obtain more

radiant energy from the sun than they lose to space through terrestrial

radiation, and vice versa for polar areas. earth has an energy remaining in the

tropics and an energy scarcity for the polar areas.

explanation:

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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