itsmechen
1. The heart because of the mechanisms that allow blood to be distributed throughout the body and return to the heart. Facilitating this continuous process are two types of blood vessels: veins and arteries.
2. Because Levels of organization helps us (people) to classify the different types of interactions that occur in the environment.
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2. Because Levels of organization helps us (people) to classify the different types of interactions that occur in the environment.
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