Answer :
(a) The overall equation is:

(b) The intermediates are :

Explanation :
<u>Part (a) :</u>
(1)
(fast)
(2)
(slow)
(3)
(fast)
By adding the three equations and cancelling the common terms on both side, we will get the overall equation.

<u>Part (b) :</u>
Intermediates are generated and consumed in the mechanism and do not include in the overall equation.
Since, intermediates will not include in the overall mechanism.
The intermediates are :

Carbon dioxide. <span>Cellular respiration is this process in which oxygen and glucose are used to create ATP, carbon dioxide, and water. ATP, carbon dioxide, and water are all products of this process because they are what is created. Carbon dioxide is released as a gas when you exhale.</span>
Answer:
Your answer is C - Heterogeneous mixture