The characteristic feature of an upland hardwood forest is : ( C ) Trees that have deep roots
An characteristic that makes a forest an upland hardwood forest is the presence of a tree canopy which covers more than 50% of the entire forest area emanating from various tree species present in the forest.
Hardwoods have deep roots which help them to get the necessary nutrients from the soil and this type of root system generally supports the structure of the trees overtime.
Hence we can conclude that The characteristic feature of an upland hardwood forest is Trees that have deep roots
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