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Lichens; these are composite plants consisting of blue-green algae; within a mycelial mass of a
fungus;algal cells are provided with support, obtain water, carbon (IV) oxide and minerals and
protection from fungus; while the fungus obtains oxygen and the carbohydrates made by algae;
this enables the plants to survive on hard bare rocks in high attitudes and polar regions;
Leguminous plants and nitrogen-fixing bacteria; the bacteria multiply and fix nitrogen from
air into nitrates for the benefit of the plant; bacteria are protected and obtain nutrients from
the plants;
Ruminants and bacteria; the rumen has bacteria that secrete cellulose; that digests cellulose in
the food/vegetation consumed by the animal to glucose for the animal; while the bacteria get
shelter and use part of digested food;
Mycorrhizal fungi and higher plants; the fungi found on forest trees gain photosynthetic
organic products made by the trees; while the trees get nutrients/minerals absorbed by the
fungus from the soil;
Tryconympha and termites; the former is a protozoan living in gut of termites; and produce
cellulose enzyme; that digests cellulose from the plant into digestible products for the benefit of
the termite; the termite on the other hand provides shelter and protection; and absorbs some of
the food for its use;
Kavungya answered the question on May 13, 2021 at 13:59
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