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What are two characteristics of substances that do not allow them to pass through the selectively permeable membrane of living cells?

please help me I need to finish this before school starts and I dont' know how to do it.

10 points best answer!

This is just a general question. I've talked to a lot of people and I've experienced through relationships. And I'm wondering if a guy get's over a girl faster because he has the mind set to do what's best for himself? Or because he actually can get over someone that fast and move on so quickly?

A month ago I broke up with this guy after we've been dating for a while, and it was a beautiful relationship, the only reason why i broke it off was because I didn't know what would happen when he left for college and I'm left behind. Afterwards we still talked, he wanted us to get back together, and to be honest I did too. But then two weeks ago he went out to lunch with an ex and that got me really mad because I thought it was him betraying me in some way.

So it was bad of me but I wanted to get back at him and I invited this guy who he's always been jealous of to ice skating with me and a few friends and afterwards he took me out for dessert. Well that night I texted him and he sounded really hurt, and he called me a liar and said that he was going to try to mend things and he didn't tell any of his family members or his friends about our breakup in hopes of us getting back together.

And then the next day he started acting cold over text, and he told all his friends that I was going on a date with that other guy when it wasn't a date. And then the next day he started ignoring me completely, and after I kept trying to reach him just to talk about things, he called me a stalker to all his friends.

I'm completely lost and it's been two weeks since he started ignoring me, I think I'm succeeding in getting over him but I don't know what would happen the next time I see him...

Gerard Butler or Robert Downey Jr.?

Robert Downey Jr. or Ryan Gosling?

Jessica Alba or Scarlett Johanson

Jessica alba or scarlett johanson?

Neil Patrick Harris or Anderson cooper?

Robert Dawney jr. Or George clooney

Ryan gosling or Ryan Reynolds?

I hate going for main stream.

I love music from 2000-2005 because they used little or no autotune

hate justin bieber

sad songs are great too as long as it doesn't make me go all emo

Music from How I met Your Mother is awesome

So many people have already come up to me asking "why aren't you guys together yet" or "are you guys ever going to go out" and it seems like he's oblivious to that and i dont know why!

he's my best friend in the whole world and i really really wouldn't want to ruin that but maybe if he just gave it a shot it wouldn't turn out so bad.

i'm so confused and i dont know whether to forget about him or to talk to him about it because i have liked him for so long

i'm 14 and he is too

I really really want to jailbreak my ipod and i'm so bad with technology. Every time i go on YouTube to look up how to download Redsn0w they show me the same thing, and it always pop up as a PDF reader when i click on it

Why?

I mean after it shows up as a PDF reader, what am i supposed to do?

anyone can give me a trustworthy site i could go on?

im starting romeo and juliet in class and i need help!