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electric rays live in rocky reefs & kelp beds
These are gamma rays and X-rays.
As gamma rays are neutral it cannot be deflected by electric field.
Some types of rays include manta rays, stingrays, and electric rays.
These are rays that can make electricity when they eat or scared.
UV rays? or Ultra Violet rays
Gamma rays consists of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
That will depend on their electric charge: plus and minus charged rays will behave in opposite ways while uncharged rays will not be affected at all by the fields.
No such animal exists; there are electric eels and stingrays, but no electric sting rays.
Electrocuting and killing the fish that they eat.
No, gamma rays are not stopped by an electric field.
Our Sun is one source of UV rays, as are electric arcs such as in welding.