You cannot make specific body parts grow unless you take hormonal supplements which can cause certain reproductive organs grow. But if you are wanting your arms to get longer you cannot really do that. The best way to make one part grow is to grow all over.
... well i can make parts of my body grow in length
You cannot make your body or parts of your body grow. Weight loss also doesn't play a part in causing you to grow much, either. Growth is pre-determined by your genetics, along with some outside factors. You cannot control it.
No they can not
No.
nails and hair!
because they are stronger than the other parts of the body
all body parts grow due to the increase in number of cells in them.
They can grow back their arms.
yesh
it just does its nature
they use it to build body parts and make cells
No they just grow they're body parts