Original sentence: Even though some species loss may occur with primary forest removal, a secondary forest at least may protect the watershed from further erosion and provides habitat.It may also be a source of wood and other forest products.It takes a secondary forest typically forty to 100 years to begin to resemble the original old-growth forest; however, in some cases a secondary forest will not succeed, due to erosion or soil nutrient loss in certain tropical forests.Secondary forests re-establish by the process of sucession
Edited sentence: It takes a secondary forest typically forty to 100 years to begin to resemble the original old-growth forest; however, in tropical areas this resemblance may be superficial, since much of the soil nutrient content may have been lost with the primary forest removal.Secondary forest re-establishes by the process of sucession