the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
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atom
the smallest particle of a chemical element that can exist.
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nucleus
the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
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cell
a small room in which a prisoner is locked up or in which a monk or nun sleeps.
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element
an essential or characteristic part of something abstract.
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evolution
the gradual development of something.
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gravity
the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
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mass
a large number of people or objects crowded together.
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molecule
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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atom
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the smallest particle of a chemical element that can exist.
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