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A number or ratio expressed as a fraction of 100.

A set of two numbers or objects linked in some way.

A term meaning ‘after birth’ (alternative terms are ‘post-birth’ and ‘postnatal).

Country in Southern Europe.

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.

The development of offspring from implantation to birth, usually in the uterus of female mammals.

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