Sandra bem coined the term to describe those people who possess both masculine, or instrumental, and feminine, or expressive, traits.

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The answer is androgyny.

Explanation:

Sandra Bem was a psychologist who studied gender and gender roles. She is famously known for introducing the Gender Schema Theory and the Bem Sex-Role Inventory or BSRI which is a test that classifies individuals on the basis of male and female traits. Bem's work has helped to redefine gender roles in society.Bem stated that each individual has both masculine and feminine traits and their gender roles could be determined on the basis of score on the BSRI. She introduced the androgyny to define people who have an equal number of both masculine and feminine traits on the BSRI.

Because the carnivores keep the herbivore population in check 

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