[Campbell Biology P.1231] Which of the following combinations of characteristics is most esse... | Practice Question

Which of the following combinations of characteristics is most essential for shallow reef-building corals to thrive, according to the text?

  • A: High temperatures (above 30°C) and high freshwater input.
  • B: Photic zone, stable tropical marine environments, and high oxygen levels.
  • C: Deep-sea conditions (200-1500 m deep) and low water clarity.
  • D: Temperatures below 18-20°C and abundant nutrients.

Explanation

The text states that shallow reef-building corals live in the photic zone of relatively stable tropical marine environments with high water clarity and require high oxygen levels. They are sensitive to temperatures below about 18-20°C and above 30°C, and are excluded by high inputs of fresh water and nutrients.