Answer:
<em><u>carbon dioxide</u></em>
Explanation:
hope this helps you!!!
Catalase<span> is an </span>enzyme<span> that helps chemical </span>reactions<span> occur</span>
1) D chromosomes
2) B a double helix
3)A chromosomes are made of DNA
4)A genes
Circadian rhythms ....its just behavior that is repeated over 24 hours
