Why do most enzymes stop functioning after being soaked in a strong acid or base? a) they have been diluted. b) their water content has been reduced. c) they have been converted to tripeptides. d) their bonding structure has been changed.

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.

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?

Which of the following forest management practices is best for reestablishing areas of forest?