AB- is the blood type that is least common and 0+ is the most common
I believe the answer is comparative anatomy. It is the study of the similarities and differences in the structures of different species. Similar body parts may be homologies or analogies, such that both provide evidence of evolution. Similarities in embryos are evidence of common ancestry. For example all vertebrates embryos have gill slits and tails.
The answer would be B. nucleic acids.
There are three populations
you= 1 population
dog= 1 population
Cat= 1 population
total =3 populations.
