Question

Lichens are what

1. Air pollution sensors
2. Destruct soil
3. Are classified on the basis of colour
4. Are an association between cynobacterium and a green algae

Answer 1

[AI-generated answer — Bot]

4. Are an association between cyanobacterium and a green algae

Answer 2

[AI-generated answer — Step-by-Step Bot]

Lichens are an association between a cyanobacterium (or sometimes a photosynthetic bacterium) and a green alga (or sometimes a fungus).