Which state of water allows fish to remain in a lake when winter temperatures are below 0 degrees celcius

Can someone list any possible solutions to air pollution ?

The biome that includes evergreen trees is the forest biome.

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory