When an electron in an atom moves from a higher, less stable level, down to a lower, more stable level, a photon is A)

created.

B)

emitted.

C)

absorbed.

D)

destroyed.

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

  the mississippians were considered to be  horticulturalists, which means they were