Question

Lichens are a type of parasitic organism that often grow on rocks and trees in areas with dirty, polluted air.

Answer 1

Answer:

process and facts, because they are using a systematic method to measure and then record data

Explanation:

Answer 2

Lichens also absorb sulphur dioxide dissolved in water. Lichens are widely used as environmental indicators or bio-indicators. If air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found. If the air is clean, shrubby, hairy and leafy lichens become abundant.