Read the passage: \'Coral reefs support 25% of all marine species. Rising ocean temperatures cause coral bleaching, which can kill entire reef ecosystems within weeks.\' What does \'coral bleaching\' refer to?

Choose the correct antonym of \'Silent\':

Choose the one-word substitution for \'Killing of a large number of people\':

Choose the correct sentence:

Choose the correct synonym of \'Ineffable\':

Choose the correct antonym of \'Sophisticated\':