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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.

Our planet. 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.

The amount of energy transferred or converted per unit time.

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

An organ, usually in male animals, used for sex, to carry sperm, and to urinate.

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

Pressure is force per unit area.

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