Fact 1: Organisms that live in marine biomes must be adapted to the salt in the water.

Fact 2: Organisms or living beings are literally things that are alive.

Given the two facts above, answer the question "Living beings in marine biomes must be adapted to what in the water?" with the following options: 
- CO 2
 - stress
 - liquid
 - salt
 - heat
 - an ion
 - energy
 - motion


 

    salt     