I'd have said the lungs as it's responsible for gas/particle exchange
Definite article is used before a noun (person place or thing) to indicate that the identity of the noun is known to the reader.
indefinite article is used before a noun that is general or when its identity is not known.
Fish, reptiles, birds, and mammals have very similar embryos with gill slits and tales, but all but fish get rid of the gills as they mature
Answer:
False
Explanation:
Chronic fatigue syndrome refers to the condition of continuous or long term tiredness which is not corrected with the sleep.
There are many causes of such type of tiredness but the exact cause of the fatigue is not known as this symptom is common to many disorders. The main causes of chronic fatigue are the weak immune system, pathogens and the stress which is increasing with modernisation.
Since there are many causes of the fatigue syndrome therefore only repeated daily activities is not the only option and thus is false.
Thus, false is correct.
