It's a rectangular shape.
Any shape you want it to be
the goblin shark has a mouth inside a mouth.
NO
It is a rectangle.
cycle
shape your mouth like your whistling then tighter . dont shape your tongue. next take some coloured water a sip into your mouth then shape your mouth and blow really hard over the water. there should be mist
The shape of a whale's mouth is slightly arches. Whales have only two teeth. They are located in their upper jaw. Their lower jaw has none.
Crater
A rectangle
Round
gosh i dont know