Agnatha and Gnathostomata

Chondrichthyes teeth can be expected to :

• Have 5 - 7 rows
• Can have 20,000 in a life time
• Lost and Replaced often
• All of the above

Where do fish take in oxygen?

• Lungs
• Gills
• Mouth
• Skin

What structure do sharks use to detect electrical currents?

• Cuadal fins
• Rostral area
• Ampullae of Lorenzini
• Lateral line

Which group of fish include sharks, rays and skates?

• Agnatha
• Chondrichthyes
• Osteichthyes

What does the term ectothermic mean?

• The temperature of the organism is regulated by the organism.
• The temperature of the organism is regulated by the environment.
• The temperature of the organism stays constant.

My scales are specialized for protection against predators and are made of a hardened enamel type material.

• Agnatha
• Chondrichthyes
• Osteichthyes
• Testudines

What fin is showing on this shark?

• dorsal
• pectoral
• caudal

Claspers in sharks are used in the act of 

• mating
• swimming
• digestion

is a flexible lightweight material made of cells surrounded by tough fibers of protein 

• bone
• muscle
• cartilage
• Intestine

Fish with bodies of cartilage and scales.

• chondrichthyes
• osteichthyes
• agnatha