Question

how do human actions negatively impact ocean ecosystems?
the ocean ecosystems are not impacted by human action.
burning of fossil fuels increases the acidity of the oceans.
increased tourism and daysailers disrupt the ocean environment.
reducing carbon dioxide emissions threatens ecosystems and food supplies.

Explanation:

• Option 1: Incorrect, as human actions do impact ocean ecosystems.
• Option 2: Correct. Burning fossil fuels releases CO₂, which dissolves in oceans to form carbonic acid, increasing ocean acidity (ocean acidification), harming marine life.
• Option 3: While tourism can impact, the primary large - scale negative impact on ocean ecosystems is more related to factors like pollution, acidification, overfishing etc. compared to tourism and daysailers.
• Option 4: Incorrect. Reducing CO₂ emissions helps ocean ecosystems, as high CO₂ causes acidification.

Answer:

B. Burning of fossil fuels increases the acidity of the oceans.