What is the difference between the terms MATTER and ELEMENT? What is an atom?
What are the 4 most common atoms to the human body?
What are molecules?
What is a chemical reaction?
According to the Rules of Atoms, will the carbon in carbon dioxide be around in a million years? How likely is it that the carbon dioxide molecule will be around? What is your reasoning?

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.

The energy required to vaporize a certain amount of a substance is greater than the amount of energy necessary to raise the temperature of the same amout of that substance by 1 degreee celcius

If a cell is placed into a hypertonic environment, what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge