5 What were the first atoms of the elements of existence at the start of the universe and the ones that make up 97 percent of all matter in the
universe?
OA. water and oxygen
OB. hydrogen and hellum
Oc carbon and nitrogen
OD. calcium and iron
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When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?

Where should a carbon monoxide detector be mounted?