I would go with mathmatical formula because of physics and what not but I'm not completely sure so if you have a different possible answer you think would be better, go with that :)
What year or grade ur in?
Answer:
Oxygen was not present on early earth
False. The number of trees is more than the number of trees cut down.
Answer:
Superficial Anatomy is most useful for <em><u>examining the outside features of the body</u></em>.
