Atria is a large part of the heart so too big for cells; arteries & veins lead away or to the heart.
Capillaries are the smallest vascular structures that allow materials to be exchanged easily between cells.
C. <span>smooth endoplasmic reticulum I am positive that this is the correct answer. </span>
Your stomach, brooooooooooooooo!
Answer: A goes back into the soil
Explanation:
Cause things from your family pass down to another. your genes from each parent could be the same and some could be different