What is the importance of lichens?

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(D) Lichens are ecologically and economically important for several reasons:$1$. Lichens contain a complex carbohydrate called lichenin,making them a

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All of the above.

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(D) Lichens are ecologically and economically important for several reasons:$1$. Lichens contain a complex carbohydrate called lichenin,making them a food source for many animals,such as reindeer.$2$. They are used in the production of various medicines,including antibiotics.$3$. Lichens like $Roccella$ $tinctoria$,$Parmelia$,and $Omphalodes$ are used in the manufacturing of different types of dyes.$4$. They are also well-known as pollution indicators,particularly for $SO_2$ (sulfur dioxide),as they do not grow in polluted areas.

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