Question

C. Circle the odd-one out giving appropriate reason.
1. External respiration, Oxygen, Carbon dioxide, Cellular respiration
2. Anaerobic respiration, Glucose, Lactic acid, Ethyl alcohol, Muscles
3. Inhalation, Exhalation, Oxygen intake, Chest expansion
4. Exhalation, Carbon dioxide, Contraction of lungs, Expansion of chest​

Answer 1

1. External respiration
2. Muscles
3. Exhalation
4. Expansion of chest