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30/07/2021 3:45 pm
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There exists a close association between the alga and the fungus within a lichen. The fungus
(1) fixes the atmospheric nitrogen for the alga
(2) provides protection, anchorage and absorption for the alga
(3) releases oxygen for the alga
(4) provides food for the alga
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30/07/2021 3:45 pm
(2) provides protection, anchorage and absorption for the alga