no won has an opening
a snake..
a part of a hollow bodied animal (cnidarians) that breaks down food for the animal cause they only have 1 opening in there body.
An animal whose gut has only one opening has a gastrovasuclar cavity. A Jellyfish is an example of an animal with a gastrovasuclar cavity.
Yes. It seems that males only have one anal opening.
The mouth is only one opening into the human body.
Octopus
it is the snake it is the only animal to do that!
A jellyfish
Adult echinoderms only have one body opening. Their larvae have two.
The famous animal the "Porifera", has 6 body openings.
Cnidarians.
The only animals with five legs are starfish. These live in the oceans.
Well, your anus contains the anal sphincter which, technically, is an opening of the body. So I would probably say the answer you are looking for is a sphincter muscle. Otherwise known as circular muscles