Answer:
Carbon
Explanation:
In addition to be found in living or once living matter, all organic compounds must contain carbon.
Answer:
Like all fluids, blood flows from a high pressure area to a region with lower pressure.
Good luck!
Is the flu vaccine a answer? If so I’m pretty sure that’s the answer.
Answer:
C
Explanation:
the first 2 choices aren't even systems at all, and D is specifically talking about the water and not mentioning animals/plants at all.
hope this helps!
