Topic: Food Energy and Respiration Subtopic: Diseases of the respiratory system
Which harmful chemical is black in color?
Answer: Tar is the chemical which has a blackish shade. It is one of the most harmful chemicals because it damages the respiratory more than any other chemical present in the cigarette.
- Why is iron important?
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- What is transpiration?
- Why are Villi essential?
- Why are plant roots important?
- What are xylem and phloem?