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Radiation is the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.

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Prey is an animal that is hunted and killed by another for food.

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A predator is any animal or other organism that hunts and kills other organisms (their prey), primarily for food.

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An omnivore is an animal that eats both plants and animals for their main food.

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A carnivore is is an animal that eats a diet consisting mainly of meat, whether it comes from live animals or dead ones.

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A herbivore is any organism that eats only plants.

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Energy is the capacity or power to do work.

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Potential  energy is the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

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Kinetic energy is energy that a body possesses by virtue of being in motion.

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A food web is a system of interlocking and interdependent food chains.

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A food chain is a diagram that shows how food energy moves from one organism to another in a given environment.

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The periodic table is a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.

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A molecule is a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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An atom is the basic unit of a chemical element.

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Matter is a substance that has inertia and occupies physical space.