Question

Which of the following is not a mechanism used by some animals to stay afloat?

A) swim bladder
B) rete
C) lungs
D) lipid deposits

Answer 1

The swim bladder is not a mechanism used by some animals to stay afloat. It is a gas-filled organ derived from the gut that helps control the buoyancy of bony fish.

Step-by-step explanation:

The swim bladder is not a mechanism used by some animals to stay afloat. It is actually a gas-filled organ derived from the gut that helps control the buoyancy of bony fish. It is believed to be homologous to the lungs of lungfish and land vertebrates.