Explain how corals are affected by tourists

Explanation:

pollution,overfishing

Corals become stressed when they are accidentally touched, polluted, or broken off from the reef by tourists. When dirt and debris are dumped into the ocean, they pollute marine ecosystems and prevent algae from absorbing the sunlight they require for photosynthesis to occur. When light is not allowed to reach the coral reefs, they bleach and eventually die.

Explanation:

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it would be d). more resources must be obtained to attain that combination of goods and services