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An ordinal number (number 8) which are numbers that tell us the position or ranking of something in a list.

A protein that acts as a catalyst for a biological reaction.

(singular) A sense organ that reacts to light and allows vision.

Of an object: To become larger; Of the universe: The gradual increase in distance between celestial bodies.

Country in East Africa.

When two or more quantities have the same value.

The rapid spread of disease to a large number of people in a given population within a short period of time.

(Plural) Sense organs that react to light and allow vision.

Country in East Africa.

Electric field is the electric force per unit charge. It is a region of space around an electrically charged particle or object in which an electric charge would feel force.