Coral reefs _________ more marine life than any other ocean ecosystem and are, not __________ , a favorite pursuit for many divers. But as well as being physically and biologically spectacular, coral reefs also sustain the livelihoods of over half a billion people. What is more, this number is expected to ___________in coming decades while the area of high-quality reef is expected to halve. In combination with the very real threat of climate change, which could lead to increased seawater temperatures and ocean acidification , we start to arrive at some quite frightening scenarios.
Options:
1) curb, harvest, support, cultivate
2) seemingly, specifically, demandingly, surprisingly
3) appear, double, countdown, unravel