Which clue would tell if the lac operon is on?

the repressor protein has fallen off the molecule.

lactose is absent.

rna polymerase is blocked by the repressor.

the cell membrane changes.

In which process is oxygen absorbed by an organism asap apex

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

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.