Where do most earthquakes occur? A- where one plate is pushed below or slides past another. B- where two plates are pulled apart. C- in the center of a plate. D- in the ocean.

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Enzymes affect the reactions in living cells by changing the

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.