Answer:
Explanation:
These are arteries, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
it's hard for people to concentrate because they always have that one person on there mind and there always thinking about them so they get so distracted with that .
37 or 37.5
because it is normal body temp.
Mutation is a rare change in the DNA of a gene, ultimately creating diversity.
