It’s B I think I never had this question but I think it’s B Or C
A decomposer eliminates waste from remains of organisms. An example is a fungus. If it were missing from an ecosystem, it would not allow for the "recycling" of organisms, and therefore there would be a buildup of animal and forest waste.
They are both the same and different in some way. But, if you're looking for the similarities, they both "rebulid" the environment that has been damaged by nature itself or by humans. The only difference is Primary succession takes longer than secondary succession. I hope this helped! :-)
