Group 7a of the periodic table contains the
a. most reactive nonmetals.
b. most reactive metals.
c. least reactive nonmetals.
d. least reactive metals.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

c8h10 is your answerr

im not exactly sure but i think its b!

i think the answer is terrae but not 100 percent sure. ▓▬▬ §