I say it is all of the above.
<span>A trait that improves the fitness of its bearer, compared with individuals without the trait.</span>
D) DNA is found in chromosomes in the nucleus, while RNA can move around the cell.
1) C
A population has to be isolated for speciation
2) D
Different species are incapable of reproducing with one another
3) D
When a population is contained, the recessive alleles can become dominant within the population
