Answer: its CO2 for the first one
Explanation:
I think it means that even though the homes/cells may appear di²erent, theyall include the same basic essentials. Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.
Ice is less densw than water (a)
The substances which are less dense than water float on water
It is not it something like sand because it would keep the fossil preserved.
