Exploring Saltwater Habitats

What percentage of the Earth's surface is covered by saltwater?

• About 50%

• About 60%

• About 70%

• About 80%

Which of the following is NOT a characteristic of a saltwater ecosystem?

• High salinity

• Low oxygen levels

• Abundant sunlight

• Freshwater input

Coral reefs are an important part of saltwater ecosystems. What role do they play?

• They provide habitats for many marine species

• They are the primary source of salt in the ocean

• They give humans a place to mine for minerals

• They absorb carbon dioxide from the atmosphere

How many different species of animals live in the oceans

• 1.3 B

• 228,000

• 1900

• 130,000

Which of the following is a common adaptation of marine animals to saltwater environments?

• Fur for insulation

• Gills for breathing underwater

• Wings for flying

• Long legs for walking on land

Which of the following human activities poses a threat to saltwater ecosystems?

• Recycling

• Overfishing

• Planting trees

• Using renewable energy sources

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