Oil in the shark's liver is used to regulate buoyance. Bony fishes use their ____________ to regulate buoyancy.
A bony fishes' body is usually covered with layers of scales, while a shark's body is covered with ________.
During spawning, femal fishes release eggs (roe), and male fishes release sperm (_______).
The tail fin on a fish is also known as the _________ fin.
The ________ of a fish senses vibrations in the water molecules that touch it. It has a similar function to our ear, which senses vibrations in air molecules.
Bony fishes have a moveble _________ that covers the gills, while sharks just have immovable gill slits.
A fish has a ______-chambered heart.a
A frog uses its ________ to help regulate its bouyancy.
Amphibians may hibernate during periods of extreme cold, or they may ________ during periods of extreme heat.
Frogs use their __________ membrane to hear.
The Jacobson's organs aid a snake's sense of _______.
Reptiles produce __________ eggs, which differ form the soft, jelly-like eggs of fishes and amphibians.
Snakes produce ________, which affect the nervous system.
A frog has a _______-chambered heart.
Snakes produce _______, which destroy red blood cells and blood vessels.