Answer:
Blood is carried away from the heart by arteries. Blood that is rich in oxygen. Blood that is low in oxygen is returned to the heart by veins. there is more pressure in arteries than in veins.
Water enters the soil in a process called infiltration, and then moves downward through the soil in a process called percolation.
Answer:
all the living things in the forest ecosystem
3)false
4)blood pressure
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Answer:
Animals needs oxygen's to survive and plants need carbon dioxide to survive. The ozone layer reflects harmful UV rays from the sun to protect the things living on Earth.