Answer:
1) The correct answer would be A. it transfers carbon to the atmosphere as carbon dioxide.
Cellular respiration refers to the set of biochemical reactions take place in a cell in order to convert the energy of glucose into adenosine triphosphate (ATP).
The carbon dioxide is released as the byproduct of the process.
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
2) The correct answer would be D. fermentation can occur without oxygen.
Fermentation is the process which occurs in oxygen is either absent or present in very less amount.
Thus, it enables the cell to survive when oxygen is not available.
For example, in humans, the muscle cells switch to lactic acid fermentation when oxygen supply is decreased during intense exercise.
It produces very less amount of ATP as compared to the aerobic respiration.
