The circulatory system, also called the cardiovascular system, is an organ system that permits blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones, and blood cells to and from cells in the body to nourish it and help to fight diseases, stabilize body temperature and pH, and to maintain homeostasis.
Answer: While active transport requires energy and work, passive transport does not. There are several different types of this easy movement of molecules.
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The kingdoms are Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia.
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Biotic or biological limiting factors are things like food, availability of mates, disease, and predators.
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