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

Lactic acid is formed in

The first type of respiration that arose on Earth was:

Radha was running on a treadmill at a great speed for $15$ minutes continuously. She stopped the treadmill and abruptly came out. For the next few minutes,she was breathing heavily/fast. Answer the following questions.
$(a)$ What happened to her muscles when she did strenuous exercise?
$(b)$ How did her breathing rate change?

During fermentation, alcohol is formed from:

Fermentation is carried out by $.........$.