Sexual attitudes and behaviors . . . a. vary by gender but not by culture, suggesting they are determined primarily by hormonal factors. b. have not been subject to regulation by most societies around the world. c. vary significantly across cultures and even within cultures over time. d. do not vary significantly across different cultural groups.

There are eight major endocrine glands, each with a different function: pituitary gland: the “brain” of the endocrine system; regulates all seven of the other glands and secretes growth hormone.thyroid: regulates a person’s metabolic rate, which is the amount of energy expended daily by a person at rest.thymus: assists in the development of a person’s immune system.adrenal gland: regulates fluid and sodium balance within the body, and secretes epinephrine (“adrenaline”) when the body is under stress, producing the fight-or-flight response.ovaries (in females) and testes (in males): control the development of secondary sex characteristics.pancreatic islets: regulate blood sugar.pineal gland: regulates biorhythms and mood, and stimulates the onset of puberty.

Perform surgeries is the correct answer.