The cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out
Mammals. I am no scientist, but I think that they are closer to mammals due to the fact that they are warm-blooded, and they raise their young. Reptiles are cold blooded and usually leave their offspring to fend for themselves.
HI there!!!!!!
It would probably be the heart, brain or our muscles; they are constantly working !
They convert energy from food into energy the cell can use - Answer
I believe there is a pill for that. I think vets can do it too.