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?

Anaerobic respiration in animals produces

The products of anaerobic fermentation are:

Which of the following is a product of glucose fermentation by yeast?

The $2$ $NADH + H^{+}$ produced during glycolysis in anaerobic respiration yield: