Question

What do you mean by lichen​

Answer 1

Explanation:

very small grey or yellow plant that spreads over the surface of rocks, walls and trees and does not have any flowers

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Answer 2

Answer:

Lichens are composite organisms composed of fungus and alga. Fungus is a saprophyte and alga is an autotroph. The Fungus supplies water and minerals to the cells of the alga while the alga supplies food; prepared by photosynthesis. A bird sitting on the back of a rhino is an example of symbiosis.