When you fill a soccer ball with air. You increase the number of air molecules in the ball, which results in.. A. More collisions
B. More pressure
C Both

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2