Which of the following is true about natural selection? a.) it occurs extremely rapidly b.) it can always be observed within a single generation c.) it causes mutations to occur d.) it causes more useful traits to be passed to offspring

Could someone me find the answer to this problem.

Name the non metal condut electricity

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?