TRUE or FALSE: Hard or reef-building corals don't have a calcareous structure.

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The statement to evaluate is: 'TRUE or FALSE: Hard or reef-building corals don\'t have a calcareous structure.'

Option 1: True. This option claims that hard/reef-building corals lack a calcareous structure. In coral biology, this is a misconception because the defining feature of hard corals (the reef-building species, or scleractinians) is that they secrete an external skeleton made of calcium carbonate. This calcareous framework is what builds coral reefs over time, providing the rigid structure that other organisms attach to and depend upon. If we understand 'calcareous structure' as calcium carbonate skeletal material, this option contradicts the fundamental biology of reef-building corals. Therefore, treating this as a true statement misstates the mineralized skeleton they produce.

Option 2: False. This option asserts that hard or reef-building corals do have a calcareous structure, which aligns with established scientific knowledge. The corals secrete calcium carbonate (in many species in the form of aragonite) to form their hard skeletons, collectively creating the reef framework. These calcareous skeletons are essential for the reef ecosystem, providing habitat and protection for numerous marine organisms. Any claim denying the presence of a calcareous skeleton overlooks this core anatomical feature and is inaccurate. A common misconception to avoid is thinking all corals are soft-bodied; in reality, the reef-building group is specifically distinguished by their mineralized, calcareous skeletons.

In summary, the idea that hard corals lack a calcareous structure runs counter to how these organisms construct their durable skeletons, while acknowledging that the skeleton is calcareous explains the reef-building capability and the structural basis of coral reefs.

OCEAN 102 A Checking-In Quiz: Lecture 17

TRUE or FALSE: Hard or reef-building corals don't have a calcareous structure.

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