PLS HELLP(50 pts in total if each question answered) here’s link to the doc in the comments

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?