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

The number of people living in an area or country.

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 branch of science that deals with matter and energy (and their interactions). This includes topics like mechanics, electricity, and atoms.

Being pregnant (carrying an embryo or foetus).

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

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

A temporary foetal organ that begins developing shortly after implantation. It plays critical roles in facilitating nutrient, gas and waste exchange.