There is a special reason that flatworms are flat. Because of their flatness the area of their 'body' is bigger (so a bigger surface area). Through this characteristic, they are able to diffuse more in and out of their endosystem.
Oh, dude, a meerkat has like around 270 bones in its body. I mean, who's counting, right? They're probably just chilling in the desert, not worried about how many bones they have. But hey, if you ever need to know for a meerkat anatomy test, now you're covered.