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Primary succession is a beginning to a new ecosystem
This ecosystem starts with bare, boring rock, yup, just rock.
This rock grows and attracts lichen (algae + fungi), which produces food for other plants that will come, building an ecosystem
As shown, you can see plants and other small animals starting inhabit this habitat, but there aren't many organisms, the ecosystem is still developing
Although this depiction of an ecosystem seems to show a fully grown one, an ecosystem can take up to 100 years to fully develop
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