9. The linear arrangement of amino acids
O primary
O secondary
teriary
O quaternary

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

I’m stuck on this question cuz i’m stupid sksksksk