A. this is because if it is warmer, their ice will melt and they will have less ice for them to live on.
D. To convert sound waves into mechanical waves.
Sorry for the other guy. He was rude. Here's the answer:
Animals excrete CO2 by cellular respiration. Since any living things besides plants can't break down CO2, it just gets put back into the environment. I hope I helped you :)
Answer:
to help mold or move the teeth
Explanation:
when you put a piece of wax on a pencil it miles to what the pencil shape is so the impression is either a vaneer or just mold of your teeth
