In which of the following processes is $CO_2$ $NOT$ produced?

Identify the correct statement regarding anaerobic respiration.

Which type of respiration appeared first in the primitive organisms and why?

The energy yield in terms of $ATP$ is higher in aerobic respiration than during anaerobic respiration. Why does anaerobic respiration occur even in organisms that live in aerobic conditions,such as human beings and angiosperms?

In alcohol fermentation,

During anaerobic respiration,the conversion of pyruvate into acetaldehyde,along with coenzyme $TPP$,the cofactor required is