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An organelle in plants and algae that contains chlorophyll and conducts photosynthesis. 

The area equal to a square that is 1 centimeter on each side.

A lens that curves out. It is thicker in the middle than at the edges, and causes light to converge. Used in glasses to correct far-sightedness.

A whole number that can be divided exactly by numbers other than 1 or itself.

(plural)In biology, cells are the basic structural, functional, and biological units of all known organisms. 

The process of naturally or artificially producing an organism with identical, or virtually identical, DNA as the original.

A steep rock face, especially at the edge of the sea.

A stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

Cone-shaped flask with a flat round bottom and a cylindrical neck.

A whole number that can be divided exactly by numbers other than 1 or itself.