Ateam of scientists are studying three species of frogs. how would the scientists use comparative anatomy and molecular biology to determine which two of the three species of frogs share the most recent common ancestor

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?