ckla unit 2 lesson 5 part 3

What is the estimated age of fish in the oceans?

• More than 400 million years

• Less than 100 million years

• Around 200 million years

• Exactly 500 million years

How many known fish species are there?

• Less than 10,000

• Around 20,000

• More than 30,000

• Exactly 50,000

What is the current level of exploration of the world's oceans?

• Almost fully explored

• Partially explored

• Not explored at all

• Completely unexplored

How do most fish reproduce?

• By laying eggs externally

• By giving live birth

• By burying eggs along the river bottom

• By hatching from larvae

Which fish are examples of live-bearing fish?

• Salmon and goldfish

• Tuna and eel

• Sharks and stingrays

• Bass and clownfish

What is the class of fish with skeletons made of hard, bony material?

• Bony fish

• Cartilage fish

• Jawless fish

• Invertebrate fish

Which fish have tooth-like scales and breathe through spiracles?

• Bony fish

• Cartilage fish

• Jawless fish

• Invertebrate fish

Which fish are jawless and include members like the hagfish and the lamprey?

• Bony fish

• Cartilage fish

• Jawless fish

• Invertebrate fish

What are some examples of vertebrates in the ocean?

• Dolphins and sea snakes

• Crabs and clams

• Sand dollars and squid

• Jellyfish and eel

What are some examples of invertebrates in the ocean?

• Dolphins and sea snakes

• Crabs and clams

• Sand dollars and squid

• Jellyfish and eel