Estrus is (a) n __________.

A) female sex hormone
B) phase in the human sexual response cycle
C) period of sexual receptivity
D) male sex hormone

Estrus

A phase in the female reproductive cycle of mammals signifying when they are sexually receptive and fertile.

Sexual Receptivity

Refers to the willingness or readiness of an individual, usually within the context of the animal kingdom, to engage in sexual activity, often determined by hormonal cycles.

Sex Hormone

Chemical substances produced by the body that regulate sexual development, reproductive cycles, and sexual behavior, including estrogen, testosterone, and progesterone.