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In biology, "colonizing" refers to species that are the first to inhabit new or disturbed environments. These are known as pioneer species. They reproduce and grow rapidly, utilizing available resources before larger competitors arrive. Examples include lichens, mosses, and microorganisms. These species play a crucial role in ecological succession, gradually paving the way for other organisms to establish themselves and change the community structure over time. Protozoans, for instance, have colonized a vast range of habitats, from soils to oceans, forming essential parts of microbial and planktonic communities.

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