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| Read each sentence and identify the word/phrase that you believe correctly completes the statement. Then, click on the arrow to see if your answer is correct. 1. The most important reef architects are the (or ) corals, which deposit skeletons made of . Most corals are colonies of many individual . 2. Reef-building corals contain symbiotic that provide nourishment and enable the coral to rapidly build its . 3. algae help reef growth by depositing , resisting by waves, and cementing together coarse . 4. Coral reefs need and , water, so they usually are found in the . Corals are very sensitive to , fresh water, and of many kinds. 5. The main types of reefs are , , and . 6. The on the side of an atoll usually is inhabited by . 7. Though the surrounding water is poor in nutrients, coral reefs have high production. This is because in reef communities, nutrients are , nitrogen is , and the few nutrients that are brought in are used efficiently. 8. According to the hypothesis, the nature of fish communities is determined by the availability of different species' larvae the larvae settle. 9. Sessile reef organisms often must compete for . Among the most important competitors are corals, , , and . 10. Among the most important grazers on reefs are , , and microherbivores. Grazers are important because they prevent seaweeds from dominating slow-growing organisms. 11. Some parasites of corals are symbionts, organisms that depend on their partners and do not . |