The physical world and its phenomena.

Essential qualities or characteristics of something.

Inherent disposition or character of a person.

Natural environment, including flora and fauna.

Biological makeup of an organism; species traits.

Natural: Relating to nature; not artificial.

Innate: Existing from birth or inherent qualities.

Organic: Derived from living matter; chemical compounds in organisms.

Essential: Fundamental quality of something's being or character.

Biological: Pertaining to life and living processes.