The average atomic mass of oxygen is 15.9994 amu. the atomic masses of its three isotopes are as follows: 0-16: 15.995 amu; 0-17: 16.999 amu; 0-18: 17.999 amu which isotope is most likely to have the greatest abundance in nature?

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

How have the greenhouse gasses increased from the year 2000 to 2018

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