Choices: 1. CO 2 2. stress 3. liquid 4. salt 5. heat 6. an ion 7. energy 8. motion
Given those answer options, answer the question: 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, living beings in marine biomes must be adapted to what in the water?
A:
4.