Light rays enter a translucent material what happening to the light rays

What is common about these molecules? a. their atoms are held together by covalent bonds. b. they are all made up of the same two atoms. c. their atoms are held together by ionic bonds. d. they are all made up of oxygen atoms only.

The first element on the periodic table of elements is carbon. a. true b. false

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass