20. Which base is normally used in the synthesis (making) of RNA but not in the
synthesis (making) of DNA?
A. adenine
B. uracil
C. cytosine
D. guanine

do yall know the answer?

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

answer///africa and asia;