Sharks

What is the largest species of shark in the world?

• Great white shark

• Hammerhead shark

• Whale shark

• Tiger shark

Do sharks have bones in their bodies?

• Yes, they have a full skeleton.

• No, they have cartilage 软骨 instead of bones.

• Only their teeth are made of bone.

• hey have both bones and cartilage.

What is the primary sense sharks use to detect prey?

• Hearing

• Smell

• Sight

• Taste

Why do sharks sometimes mistake humans for prey?

• Humans look like seals in the water.

• Sharks are naturally aggressive toward humans.

• Humans emit a scent similar to shark prey.

• Sharks are curious and like to investigate.

What is the purpose of a shark's lateral line system?

• To help them see in dark water.

• To detect vibrations and movement in the water.

• To regulate their body temperature.

• To communicate with other sharks.

How do sharks reproduce?

• Only by laying eggs.

• Only by giving birth to live young. 胎生

• By laying eggs, giving birth to live young, or a combination of both.

• Sharks do not reproduce; they are immortal.

What role do sharks play in the ocean ecosystem?

• They clean the ocean floor.

• They are apex predators and maintain balance in marine ecosystems.

• They produce oxygen for the ocean.

• They help coral reefs grow.

Why is it difficult to track and study sharks in their natural habitats?

• Sharks are too small to be detected.

• Sharks are highly mobile and travel vast distances.

• Scientists are afraid of sharks.

• Governments restrict shark research.

How do sharks' teeth adapt to their diet and feeding habits?

• Their teeth are always the same shape, regardless of diet.

• Their teeth change shape depending on their diet—e.g., serrated for cutting flesh or flat for crushing shells.

• Sharks do not have teeth.

• Their teeth are only used for defense, not eating.

What do sharks primarily eat as prey?

• Small shrimps and plankton

• Dead whales and scavenged carcasses

• Coral and seaweed

• Humans and large mammals

• Fish, seals, and squid