It allows them to study and analyze the species.
Semi-conservative DNA replication means that one stand is new DNA and the other contains a newly synthesized strand.
A sex link trait is connected with a <span>tiny chemical assembly instruction inside of living things </span>that is carried only by the male or female <span>parent. Such as the x and y chromosomes.</span>
Evolution:
. Natural selection
. prehistoric times
. fossils
. certain body parts
. animals that are different but have similar traits