3 Complete the sentences by choosing a, b or c. 1 Coral reefs are... a islands. b towns. c ocean communities. 2 Coral is... a hard. b soft. c blue. 3 Coral polyps are... a huge plants. b sensitive creatures. c bright-coloured algae. 4 Coral reefs die because... a algae lose their colour. b people fish them. c the oceans' temperature increases.

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