Carbon dioxide :)
hope it helps!
Hello Pgoodrichstat!
The process that helps gas exchange occur is called diffusion.
Cheers!
-Blizzard
are you gonna give me the user and pass
I think it's in Antarctica. The frozen water :/
Answer:
Mammals first appeared
Explanation:
The dinosaurs became extinct one million years after the Cenozoic era started. The mammals first appeared as the modern culture first appeared in that era.
