Final answer:
Mosses are pioneer species in primary succession, while grass is a later successional species.
Explanation:
Mosses are pioneer species that play a crucial role in primary succession due to their ability to colonize harsh environments and start the process of soil formation. Mosses provide food and shelter for other organisms, kickstarting the ecosystem development. Grass, on the other hand, is not a pioneer species but rather a later successional species that thrives after the initial establishment of mosses and lichens.
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