Why lichens are considered as pollution indicators?

Lichens are described as indicators of……… .

Which of the following is used as an atmospheric pollution indicator?

Which features can be considered as all inclusive characteristics of life? Why?

Why nucleus is considered as control unit of a cell.

Why horse and ass are considered to be two different species or animals?

Which are the types of pollution?

Define water pollution.

What are the reasons responsible for air pollution ?

If natural materials are pollutants, why do we not perceive their adverse effects during their their use ? When such materials are referred as pollutants ?

Why are fungi considered as heterotrophic organisms?