Not when there are storms and the sea level rises.
In the coral reefs, they live in holes or creases, where they are safe from predators at night.
Safe from what
Not enough information. If you mean an electrical cable, no it is not safe unless you have isolated it and verified that it is no longer "live"!
I think 500 m is enough.
They are very safe. Not completely safe but more then enough-
Yes, very. The Cayman Islands are one of the safest countries in the Carribean.
They are important to humans because animals in the corals reefs can be used to make medical drugs that help cure diseases, they can provide food for more that 1million people, and some lime stone reefs can be used for human bone grafts.
No it is not safe to live there because there are hurricanes.
The turtle will likely eat the rosy barbs if they are small enough.
If you mean "Is Mars safe to live on?" then no.
yes it is its all about finishing islands and having fun
If it is large enough.