Here are some options depending on what you want to emphasize:
General terms:
* Organisms: This is a broad term for any living thing.
* Living things: Another general term for anything that is alive.
* Biota: This refers to the collection of all living organisms in a particular region.
More specific terms:
* Fauna: Refers to animal life, so it would include both water and land animals.
* Flora: Refers to plant life, which can be found in both water and on land.
* Biodiversity: This encompasses the variety of all life forms in a particular area, including both aquatic and terrestrial species.
Descriptive phrases:
* Water and land creatures
* Aquatic and terrestrial life
* Creatures of the sea and the land
The best choice will depend on the specific context of your writing or conversation.
