How many years ago did fish first appear?

• 500,000

• 5 million

• 50 million

• 500 million

Tags

NGSS.MS-LS4-1

Which type of fish is the most primitive?

• Jawless

• Cartilaginous

• Bony

• Fresh water

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Cartilage is different from bone because

• It's more flexible

• It's lighter

• Both answers are correct

The lobes of the caudal fin in most sharks are:

• Of equal size

• The top lobe is bigger than the bottom

• The bottom lobe is bigger than the top

These cartilaginous fish live on the bottom, lack a stinging spine and lay eggs

• Sting rays

• Electric rays

• Manta rays

• Skates

Cycloid scales are thin, flexible and overlapping. What type of fish has them?

• Jawless

• Cartilaginous

• Bony

Where are shark jaws located to allow for a very streamlined form?

• Dorsally

• Ventrally

• Anteriorly

• Posteriorly

Fish olfactory sacs help fish

• Balance

• See

• Smell

• Detect electric impulses

What is composed of bony plates and protects bony fish gills?

• Gill rakers

• Gill arches

• Operculum

• Gill slits

What do iridophores do for fish coloration?

• Provide colored pigments

• Reflect different wavelengths of light

• Absorb light to make skin darker