Marie: Earth's atmosphere mainly contains nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and water (H20).
What kind of acid could be formed from these building blocks?
a) Ammonia
b) Potassium hydroxide
c) Nitric acid
d) Carbonic acid

Any help? Thanks!

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

the answer your looking for is c).

it would only be the stuff in module eight so you need to study all the lessons in that you also could check the flvs

hope this : )