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All living cells need energy to function in order for the chemical reactions occurring in the cells to take place. In humans this energy is obtained by breaking down organic molecules such as carbohydrates, fats and proteins.
Individual, population, community, biome, ecosystem
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d.) anterior cruciate ligament (ACL)
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Brain structures called the hypothalamus and pituitary gland control the menstrual cycle.
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Energy:
The rate of movement per unit time of an object relative to all the other objects in the universe.
Generally we have it relative to the road on earth. For instants, you could travel 80 miles per hour relative to the road.