They are called stomata, tiny holes that regulate the intake/output of gas, such as carbon dioxide and oxygen.
Urethra.
The opening in called a urethra, in both males and females.
urethral meatus
The large opening at the top of the sponge, where water leaves, is called the osculum. It is responsible for expelling the water and waste products from the sponge's body.
stoma (pural) stomata
Solid waste leaves the body through the anus, a muscular opening at the end of the gastrointestinal tract.
The openings on the sides of leaves are called stomata. Stomata regulate gas exchange in plants by allowing carbon dioxide to enter and oxygen to exit during photosynthesis.
The air comes through the right opening instead of the left opening because hot air from the candle leaves via the left opening.
Carbon dioxide enter the leaves through the called stomata found under the leaves.
Spiracles is the opening that takes in air in grasshoppers. Much like humans, they have a tracheal system where gases are exchanged.
The sievelike disc-shaped opening in an echinoderm's body through which water enters and leaves is called the madreporite. It is the entrance to the water vascular system, which helps in functions like respiration and movement.
Stomata