Amino Acid sequences in one organism that resemble those of another suggest а
coincidence
shared ancestry
great number of mutations
lack of evolutionary relationship

What factors contribute to the effect an environmental toxin has on the human body?

In sheep, the allele for belly fur (a) is dominant to the allele for no belly fur (a). a mother with the genotype aa and a father with the genotype aa produce an offspring.

Which pair of chromosomes determines sex in humans? a.15th b.1st c.23rd