Oxygen & hydrogen this may be the answer
The first answer is species and the second answer is C
A)test the effect of raising Ph on enzyme action
the splitting of a single cell into 2 identical cells which are also identical to the parent cell.
1.) When a boy was skating, kinetic energy was high, and thermal energy was low.
2.) As the boy applied his brake pad, kinetic energy was decreasing and thermal energy was increasing.
3.) When the boy stopped, kinetic energy was low, and thermal energy was high.
4.) At all times, total energy = kinetic energy + thermal energy
hopefully my answered helped!
(If my answers helped you tell me, therefore I know.. that I did them correctly. Anyways, have a great day/night!)