The common phase between aerobic and anaerobic respiration is called:

Number of $CO_2$ molecules released in glycolysis is $:-$

In glycolysis,a glucose molecule is converted into:

Given below are two statements:
$Statement-I$: Glycolysis is a common step in anaerobic as well as aerobic respiration and it occurs in the mitochondrial matrix.
$Statement-II$: The first five steps of glycolysis constitute its preparatory phase.
In the light of the above statements,choose the correct answer from the options given below.

Which stage is common to lactic acid fermentation,alcoholic fermentation,and aerobic respiration?

What is the net gain of $ATP$ molecules produced by glycolysis in anaerobic respiration?