 Because we don't want anybody to feel bad or anything like that. Okay, so let's just do this one. This will be good for when we get to the organic chemistry section anyways. So which functional groups are present in these molecules? Well, in cholesterol, you see that we've got an OH group there. You could call that a hydroxyl group, or you could even call this an alcohol. I would accept either one of those. Here, you've got a double bond. So you can call that a double bond or an alkene. Yeah, it's an alkene. In this fatty acid here, you can see you've got another double bond there. You've got a redouble bond. Or you could call that an alkene again. And over here, you've got this portion here. This is the carboxylic acid, hence the name fatty acid. That's what that acid means. And then we've got this molecule down here. So here, that functional group there looks like kind of like carboxylic acid. Except for the carboxylic acid has an H there. And this has a carbon chain, so we call this an ester. So it's got its own different name than the carboxylic acid. When you change that hydrogen to something else.