A. Pressure.. Because there is a lot of water going in the same direction
There is a need of attractive force in explaining the existence
of a stable nuclei because there will be a presence of repel in protons to each
other, with that, there is a need to provide another force in which will help
and prevent them from having to fly apart.
The earthworm has a closed circulatory system, and there are 3 main vessels: <span>aortic arches, dorsal blood vessels, and ventral blood vessels.
aortic arches: It functions as the heart of the earthworm
dorsal blood vessels: Responsible to carry blood to the front of the body
ventral blood vessels: Responsible to carry blood to the back of the body
hope this helps</span>
Answer:
The answer should be 
Since the pedigree has two different letters, it will have one letter of each, but the DNA will still be A.
