The correct answer is all of them, none of the answers are actually air masses. This is a poorly worded trick question :)
I hope this helps!!
After millions of years, the remains of living things will turn into fossil fuels which are natural fuels. The combustion of these fossil fuels is important for the running of machinery, raising temperature in reactions and many more.
phenotype is observable so A
the answer is b ..........
Explanation:
b
