The author is the one who writes it and the one who discusses it is the narrator
Answer:
A. Effector
Explanation:
The Kidneys act as an effectors in blood pressure regulation.
The uterus is a hollow muscular organ located in the female pelvis between the bladder and rectum. It is an organ in the lower body of a woman or female mammal where offspring are conceived and in which they gestate before birth; the womb.
They got used to it or invented something that made it easier to live in that environment