Explanation:
21 % of oxygen is present in air .
hope it is helpful to you
Answer:
Two, I'd say, unless there's some trick to what you're asking! :)
Explanation:
Fission is similar to mitosis because they both involve splitting.
Answer: <span><span>d. mitosis</span></span>
The absorted energy makes molecules in air move and expand therefore decreasing the airs density..
