Only Bone marrow. intra crinal nervous muscle and joint
Answer:
The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell. When oxygen passes into the bloodstream, carbon dioxide leaves it.
Explanation:
Answer:
2.Population, community, ecosystem, biome is the order of the individual numbers
Explanation:
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Answer:
B. the variable that is changed and being tested
