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        | An organism that is capable of making nutrients from inorganic materials; these include green plants that make carbohydrates through the process of photosynthesis. |  | 
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        | The different forms in which a chemical element occurs, each differing in physical properties. |  | 
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        | A chemical bond in which the attractive force between atoms is created by the sharing of electrons. |  | 
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        | An organism that cannot make its own food and instead relies on the consumption of other animals or plants. |  | 
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        | A substance that contains carbon and is often derived from living things. |  | 
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        | The scientific study of the chemical substances, processes, and reaction that occur in living organisms. |  | 
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        | The process in which light energy is used to produce chemical energy. |  | 
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        | The building blocks of proteins, must be obtained by the diet or synthesized by the body. |  | 
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        | Molecules from which living things are made. They are important to the survival and functioning of organisms. |  | 
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        | Biomolecules that contain carbon, hydrogen, and oxygen. They are an important source of food and energy. |  | 
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        | Biomolecules that are not soluble in water. They include waxes, oils, cholesterol, and triglycerides. |  | 
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        | Biomolecules that are found in all living cells that transport genetic information. |  | 
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        | Biomolecules that are composed of amino acids and are essential to the structure and function of all living cells. |  | 
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        | A system of responses to disturbances within a biological system. |  | 
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        | A state in which biological processes are in balance. |  | 
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        | The process or mechanisms that systems in an organism use to maintain stability and resist change. |  | 
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        | The ability of an organism to resist change or to return to its original state after a disturbance. |  | 
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        | A feeling of weakness or lack of energy caused by lowered blood sugar levels. |  | 
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        | The raising of the body's temperature to assist white blood cells in fighting off a pathogen. |  | 
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        | A condition that affects human function; it results in medical symptoms. |  | 
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        | A cell invaded by a virus. |  | 
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        | The ability of an organism to resist disease. |  | 
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        | An injection of a substance that can stimulate the body's production of specific disease-fighting cells. |  | 
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        | A system that fights infection by filtering germs out of tissue and transporting white blood cells. |  | 
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        | Agents that can cause disease; examples include bacteria and viruses. |  | 
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        | A very small particle of nucleic acid surrounded by protein; they can replicate only inside a host cell. |  | 
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        | An organism that is living in or on another organism. |  | 
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        | Substances that cause an allergic reaction. |  | 
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        | A disorder in which the body attacks its own cells and tissue. |  | 
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        | The study of diseases that affect a large number of people to find the cause of the disease and track how it spreads. |  | 
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        | A disease or disorder that has no known cause. |  | 
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        | A condition where the body's immune system is damaged or not functioning. |  | 
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