... their heads to judge distances Eyes on the side of their heads for all-round vision Plants can be adapted to avoid being eaten by having sharp spines or by producing toxins. Disease acts like a predator in controlling population growth. Competition A coral reef is a good place to look for examples of competition. Read through this description of coral reefs and the questions and answers which follow. Most tropical seas are surprisingly short of life because they hold fewer minerals than colder waters. In tropical shallow seas, where the water temperatures are above 18°C, coral reefs can develop. The main species there are corals, which can grow in waters of up to 30m deep. Corals are animals but they have algae inside their cells which can photosynthesise. Corals feed by filtering small floating pieces of food and on the food that leaks out from the algae in their cells. Large and complicated food webs are built up ...

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