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

In biochemistry, proteins are biomolecules and macromolecules made up of long chains of amino acids.

A planet is an object that orbits a star (like the sun), is big enough for gravity to force it into a spherical shape, and is big enough that gravity has cleared any other objects out of its orbital path.

An academic or scientific field of study concerned with the behavior of humans and animals and related mental processes. Psychologists typically have Ph.D. degrees and while able to evaluate and treat mental disorders, are rarely able to prescribe medication. (Contrast with psychiatry)

How likely something is to happen.

A bacterium, virus, or other microorganism that can cause disease.

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

In biochemistry, proteins are biomolecules and macromolecules made up of long chains of amino acids.

Mathematical symbol for addition.

The pound is the unit of money which is used in the UK.