Our Planet | Coastal Seas

What is the primary reason that 90% of all marine creatures live in coastal waters?

• The coastal waters are deeper than other parts of the ocean.

• Coastal waters have more predators.

• The seafloor in coastal waters is within reach of sunlight.

• Coastal waters are warmer than other parts of the ocean.

How do bottlenose dolphins in the Everglades catch their prey?

• By using their speed to chase down fish.

• By herding fish into a ring of mud.

• By waiting for fish to swim into their mouths.

• By using their tails to stun fish.

What role do mangroves play in coastal ecosystems?

• They protect coasts from hurricanes and capture carbon dioxide.

• They provide food for large fish.

• They are a primary source of oxygen for marine life.

• They are the main habitat for sharks.

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Why are coral reefs considered important for marine biodiversity?

• They cover a large portion of the ocean floor.

• They are home to a quarter of all marine species.

• They are the primary source of food for all marine life.

• They are the only habitat for sharks.

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How do whitetip reef sharks differ from gray reef sharks in their hunting strategy?

• They hunt in larger groups.

• They are more agile and can reach hiding places other sharks can't.

• They hunt only during the day.

• They rely on sound to locate prey.

What is the primary reason for the decline in shark populations worldwide?

• Climate change
• Habitat destruction
• Overfishing
• Pollution

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What happens to corals when sea temperatures rise by a degree or two?

• They grow faster and become more colorful.

• They sink to the ocean floor.

• They become more resistant to predators.

• They expel their plant partners and turn white.

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What is the consequence of corals expelling their plant partners?

• They start producing their own food.

• They become more resistant to disease.

• They attract more fish.

• They lose their main source of food and may starve.

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What is the primary reason that the seas in higher latitudes are more productive than those in the tropics?

• They have warmer waters.

• They have longer summer days and nutrient-rich waters.

• They are closer to the equator.

• They have more marine life.

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Why are sea otters considered crucial to the health of the kelp forest?

• They keep the number of sea urchins down.

• They provide shelter for fish.

• They fertilize the kelp.

• They eat the kelp.

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