25 !
a pathogen that enters the respiratory track would have to get past which of the following respiratory defenses before being able to infect the bloodstream?

a. cilia and red blood cells
b. cilia and white blood cells
c. flagella and white blood cells
d. flagella and red blood cells

if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.