Question

what are lichens most sensitive to?

Answer 1

Explanation:

Lichens are well known as sensitive indicators of air pollution, particularly for sulfur dioxide. In part, this is related to their unique biology.

Answer 2

${\underline{\underline{\bf{Answer}}}}$

Lichens are mostly sensitive to air pollution, particularly for sulfur dioxide. 

${\underline{\underline{\bf{More~Information}}}}$

Lichens are a group of plants of composite thalloid nature, formed by the association of algae and fungi.

Lichen reproduces by all the three means – vegetative, asexual, and sexual.