Help me with science for brainiest

The boiling point of liquids is very high what does it indicate

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.