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 blood important?
- What are properties of blood in arteries?
- What is flower?
- How does air reach blood vessels?
- What makes heart sound like lub?
- Where are pulses felt?