What is the advantage of seed plants over spore plants?

The advantage is that the seeds have several ways of spreading and they are more protected from various environmental factors. Spores that are thrown by fungi or some plants are spread by wind to relatively small areas. Plant seeds can be spread by the wind, onto animal hair, or when the seeds are eaten by animals. Therefore, many seeds are surrounded by juicy and nutritious fruit that attracts animals. They eat the fruit and become seed carriers for a while.