Explanation:
According to the given information it can be inferred that these two species require a similar soil pH
Fungus and tree shows an interdependence on each other
Fungus cannot make their own food hence is dependent on trees for its food requirements whereas in return helps trees in their biochemical processes
This shows a symbiotic relationship where both trees and fungus are being benefited from each other
Fungus grows on the roots of birch trees hence their soil requirement will be same