Answer:
bony
swim bladder
mouth
operculum
Explanation:
Fill in the blanks.
Osteichthyans" commonly referred to as "fishes" have a _____Bony___________ endoskeleton.
Fishes control their buoyancy with an air sac known as a _____swim bladder_
Fishes breathe by drawing water over ___mouth ____ in chambers covered by a bony flap called the __operculum.______________.