Question

What would be the disadvantage of having a fixed lower jaw

Answer 1

hey mate

we will not be able to talk.

Answer 2

The human jaw is divided into two parts,upper jaw and lower jaw.Between this two parts of human jaw,the lower jaw is movable.

Due to this movable lower jaw,we are able to open our mouth.This helps us in talking,eating etc.

If this lower jaw is non-movable,we will no able to eat or talk.

And that's the ultimate disadvantage of the non-movable lower jaw.