True or false, cilia and mucus help keep our lungs clean and healthy?
Plz answer! Will make brainest!

Ineed with my science work! it’s due tomorrow!

In which of these cases are the two wave points considered to be in phase with each other?

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