Simplify the following text for a Grade 8 native English-speaking person.
Original: The animal adjusts its buoyancy by osmotically pumping gas and fluid into or out of the camerae along the siphuncles .
Simplified: When water is pumped out , the animal adjusts its buoyancy with the gas contained in the chamber . Buoyancy can be controlled by the osmotical pumping of gas and fluid into or from the camerae along the siphuncles .