Answer:
d. cells
cardiac tissue are made up of cells.
(If you didn't know already )homosexuality is a very touchy subject to talk about for some people.
( )=these just mean that you could use it in the sentence
there you go...i hope its good
Capillaries connect the arteries to veins. The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs. The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. Veins carry the blood back to the heart.
B) Fossil fuels take millions of years to form
