Generally lung cancer patients are heavy smokers. Why?

White lung cancer is caused by :

Automobile tyres have generally irregular projections over their surfaces. Why?

Alveoli beome enlarged and damaged with reduced surface area in heavy smokers.The condition is called:

Lung alveoli are lined by squamous epithelium. Why?

Why people in desert wear heavy clothes?

Explain why? Chloroplasts are generally located at the outer margins of mesophyll cells.

Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why?