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A unit of mass (which we feel as weight).

The presence in or introduction into the environment of a substance which has harmful or poisonous effects.

A process used by plants and other organisms to convert light energy into chemical energy.

A small body of still water formed naturally or by artificial means.

A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy.

A disorder that can occur during pregnancy or after childbirth in which there is high blood pressure and other signs of organ injury.

A whole number that can not be made by multiplying other whole numbers (factors are 1 and itself).

A reduction in the human population - causes violence, disease, decreased birth rates etc.

An epidemic that has spread across a large region (multiple continents or worldwide), affecting a lot of people.

The ovule producing part of a flower.