1. • 1 . Breathing is the exchange of air
between an individual and the
environment and it involves the breathing
in and breathing out processes.
Respiration, on the other hand, is the
oxidation or ‘burning’ of food to
produce carbon dioxide and water, and to
release energy .

2. Checkpoint 1.3
• 1 . A passive smoker is a person who
does not smoke but receives second hand
smoke from smokers around him .