This is the organ where gas exchange occurs in fish.

How many chambers does a fish heart have?

What class of fish are sharks classified in?

Sharks are classified into the same class as which other fish?

In fish, what is the name of the fluid-filled canal that detects movement and vibrations in water?

What is the name of the internal structure that controls a fish's depth in the water?

Which of these is the common example for agnatha/jawless fish?

2/3 of the shark brain is dedicated to this sense.

Which of these is the largest class of fish?

Most fish utilize this type of reproduction/fertilization.

The tail fin of a fish is also known as the __________ fin.

Which of the following is not controlled by the fins of the fish?

The fish class osteichthyes is unique because the fish classified into this group have a(n) _________________.

Which of the following is not a species of shark?

What are the three sub-classes of bony fish?

Which of the following shark species is the largest?

Which of the following shark species is the fastest swimmer?

Hagfish produce and excrete this substance to make themselves harder to catch.

Which of these is the main difference between rays and skates?