What are two advantages that seeds have over spores?

If I remember correctly seeds have the following that spores don't have:

1. they can carry their own nutrients, which helps in the early development stage of the seedling

2. Seeds can stay dormant for a period of time thanks to their seedcoat, which is called the testa (outer protective area of the seed), until the time is right for germination.

Hopefully this helped and good luck.