A student researching oceans has taken notes:
• Oceans cover about 71% of Earth's surface • The deep ocean remains largely unexplored • Oceans absorb about 30% of human-produced CO2 • Ocean acidification threatens marine ecosystems • Overfishing has depleted many fish populations
9
readingThe student wants to explain how oceans mitigate climate change.
A
Oceans cover approximately 71% of Earth's surface.
B
Oceans mitigate climate change by absorbing about 30% of human-produced CO2—though this causes acidification that threatens marine life.
C
The deep ocean remains largely unexplored by scientists.
D
Overfishing has significantly depleted many fish populations worldwide.
Correct Answer: B
Choice B. Absorbing 30% of CO2 explains climate mitigation.