Formal:
* Biota: Refers to the total flora and fauna of a region.
* Organisms: This is the most direct and commonly used term.
* Life forms: Emphasizes the diverse forms of life.
Informal:
* Creatures: A more general term for living beings, often used for animals.
* Beings: Emphasizes the existence of life.
* Living things: A straightforward and understandable phrase.
More specific:
* Flora: Refers to plants.
* Fauna: Refers to animals.
* Microorganisms: Refers to microscopic living things.
The best word to use will depend on the specific context and the level of formality you want to convey.
