the heart has valves in place to prevent the backflow of blood.
DNA Replication How DNA Makes Copies of Itself. Before a cell divides, its DNA is replicated (duplicated.) Because the two strands of a DNA molecule have complementary base pairs, the nucleotide sequence of each strand automatically supplies the information needed to produce its partner
The answer is the occipital lobe of the brain
Genotypes=genetic makeup
Phenotypes= physical characteristics
You can not change your genetics, so that means C is out!
Said genotypes are usually inherited as well so A is out.
I’m not 100% sure but i would deduce the answer is B
