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| environment | bioindicator | quality |
| acid | soil | sulphur dioxide |
| crusty | pollution | roots |
| symbiotic | cyanobacteria | bioindicators |
| Industrialisation | leafy | Lichen |
| air | extinction | chlorophyll |
| atmosphere | environments | health |
1. Lichen algae part gets affected mostly due to the environmental . Pollution destroys the and there is inhibition of photosynthesis.
2. are used to study all the types of including terrestrial ecosystem.
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