A wave that travels through is called a wave? PLZ be specific just one word answer

Apossible explanation for a set of facts that can be tested by further investigation is called

Which of the following is an example of motion in two dimensions?

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque