What would I write in there? I’m confused

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

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

In salt water solution, the salt is the blank