An absence of menstruation in a postpubescent female is known as amenorrhea. It is a state in which a woman of reproductive age loses her menstrual cycle. Very often athlethes lose their periods, because of losing too much energy, so the body has not enough energy to release an egg and to get the period.

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3 years ago

Some researchers believe there is no such thing as true altruistic behavior because they believe that helping behavior__________

Rom4ik [11]

Because of the belief that helping behavior is motivated by self-interest, it led to claim that there is no such thing as true altruistic behavior.

<h3>What is a helping behavior?</h3>

This refers to any voluntary actions that is intended to help the others with reward regarded or disregarded.

However, since people believed that helping behavior is motivated by self-interest, it led to belief of no such thing as true altruistic behavior.

Therefore, the Option B is correct.