Final answer:
Succession opens up new niches for organisms by providing new habitats as a result of ecological changes in an ecosystem over time.
Step-by-step explanation:
Succession is the process of ecological change in an ecosystem over time. It opens up new niches for organisms by providing new habitats. When a disturbance such as a forest fire or volcanic eruption occurs, it creates open spaces and exposes bare rock or soil. This allows pioneer species, such as mosses and lichens, to colonize the area and begin the process of succession. As the ecosystem develops and different plant and animal communities establish, new niches are formed, offering opportunities for other organisms to exploit different resources and occupy specific roles within the ecosystem.