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A cylinder is a three-dimensional solid consisting of two parallel circular bases joined together by a curved surface.

A lens that curves inward.

Country in the Balkans.

A set of values that show an exact position using the x, y and z axes.

(singular) In biology, the cell is the basic structural, functional, and biological unit of all known organisms. 

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

A volume that is made by a cube that is 1 centimetre on each side.

To become reduced in size.

Determining whether one number is greater than, less than, or equal to another number.

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