Is the speed of light faster in helium or air?

the answer is d

lies a supermassive black hole called sagittarius a*, or sgr a* for short.

answer; /// i believe that the correct answer is (c)

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.