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A growing body of knowledge has changed our perception of larval life and behavior. The classical view was of passive larvae carried by ocean currents, settling when they reached some critical stage of competency. If a larva happened to be over appropriate habitat at that stage, its chances were good. If it was somewhere less favorable, such as over great ocean depths, then it was game over. We now know that larvae are much more active than this in their settling activities. Larvae are attracted to coral reef areas by both sounds and smells emitted by reefs, and move actively toward appropriate stimuli. Once over a reef, larvae _________________ that differ among species; some larvae will settle and then ascend back into the water column if conditions are inappropriate. Larval settlement is therefore not a parachute drop but more a bungee jump. Maintenance of high diversity on a reef demands protection of not just adult habitats but also of settlement habitats, which are often different from and far removed from adult habitats.
1) conform to change in ecosystems
2) change the aquatic food chains
3) show strong habitat preferences
4) wait for the reef to give rewards
5) attract others and build colonies
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