Veins have all of the following characteristics: (choose 4) A)Large lumen (space inside the vessel)
B) Thick walls
C) valves
D) small lumen (space inside the vessel)
E) thin walls
F) one cell thick
G) low blood pressure

human didn't come from monkeys man i hate these stupid teachers

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.

c is the correct answer!

i am sorry but i need more information and a picture.