Both spores and seeds are dispersed in order to establish new populations of individuals. But, compared to dispersing an individual spore, dispersing an individual seed is:

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Dispersing an individual seed is generally more costly than dispersing an individual spore, as seeds are typically larger and contain more energy and resources to support germination and establishment. However, seeds also have a better chance of establishing a new sporophyte, as they have a protective seed coat and usually contain a nutrient-rich endosperm that can provide the energy and resources needed for early growth. Therefore, while the cost of dispersing a seed is higher, the chances of successful establishment and growth are also higher.

Both Spores and Seeds Are Dispersed in Order to Establish