The generation of an electric current in a closed circuit by a changing magnetic field is 1) electromagnetism2) electromagnetic induction3) electromagnetic spectrum4) electromagnetic force.

The correct answer is option 2.

Explanation:

When any closed circuit is kept in the varying magnetic field small amount of  electromotive force is generated in the in the circuit which gives rise to generation of electric current in a circuit. This phenomena of the induction of the electricity is named as electromagnetic induction.

This phenomena was discovers by Micheal Faraday.

what's the rest of the question

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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