A scientist discovers that a strand of DNA is 20% Guanine and 30% Adenine. What percent of Cytosine and Thymine will it contain?

20% cytosine

30% thymine

Explanation:

Cytosine is paired with guanine so they must have the same percentage. Adenine is paired with thymine so they also must have the same percentage.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.