Which arrow identifies the change in energy in which the energy of the products is less than the energy of the reactants? (identify the arrow by typing the letter corresponding to the arrow)?

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

What does the cell nucleus do or, how does it function?

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)