I believe the answer is A
Answer:
c
Explanation:
a b and c are all signs of life but energy can be in objects not just life.
The arteries take deoxygenated blood back to the heart.
When a man and a women come together it is called sexual reproduction.
(had to keep it pg for the kids)
its necessary to keep the generations of humans alive. if this doesn't happen the human race will be no more.
There are all kinds of people who have different kinds of kids(skin color and features)