Connecting link between glycolysis and $TCA$ cycle is

Respiration is a

In rabbits,where does respiration occur?

Given below are two statements.
Statement $I$ - During respiration the respiratory substrate directly unite with oxygen.
Statement $II$ - The primary process of respiration consists of removal of hydrogen from the respiratory substrate.
In the light of above statements,Select the correct option given below:

$CO_2$ is released during which of the following processes?

Respiration occurs in .........