Answer:
glycolysis is the correct answer.
Step-by-step explanation:
The first stage of cellular respiration is called glycolysis .
Cellular respiration in which food is converted into Adenosine triphosphate, which is used by cells to perform the body function.
Cellular respiration process involves three stage.
The first stage is glycolysis: which takes in place in the cytoplasm, in which the sugar molecule is converted into ATP.
Glycolysis takes place both in the presence and absence of oxygen.
In the presence of oxygen, pyruvate is produced and in the absence of oxygen lactate is produced.