The classification group that is made up of related species is the

Genus

Explanation:

In taxonomy, genus refers to a group of organisms that include one or more species that are closely related to each other. Organisms that are in the same genus share common features, characteristics, and/or traits but are not quite the same species. If a genus has only one species under it, it is called monotypic, but if there is more than one (which could reach more than 100 in some organisms!) it is called polytypic.

Right under genus would be species in biological organization. When naming organisms using binomial nomenclature, genus is first named, then species.  

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: