2.beacause levels of biological organization helps us (people) to classify the different types of interactions that occur in the environment.
Explanation:
1.Beacuse circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide. These roadways travel in one direction only, to keep things going where they should.
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1.circulatory system
2.beacause levels of biological organization helps us (people) to classify the different types of interactions that occur in the environment.
Explanation:
1.Beacuse circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide. These roadways travel in one direction only, to keep things going where they should.