Question

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Answer 1

The field lines inside the solenoid are parallel straight lines which indicate that the magnetic field is uniform inside the solenoid. The direction of the magnetic field depends upon the direction of the current. Reversing the direction of the current reverses the direction of the magnetic field.

Answer 2

ANSWER :-

The neutral theory of molecular evolution holds that most evolutionary changes occur at the molecular level, and most of the variation within and between species, are due to random genetic drift of mutant alleles that are selectively neutral.