3. What was once believed about the make-up of gases?

What is the correct term for living the most sustainable life you can within your current circumstances?

Drug abuse will not lead to physical and psychological dependence. true or false ?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.