because many seeds cannot be passed be digested by the animals, passed out in an animals waste at some distance from the original plant.
All plants produce Seeds for ONE very important Reason.
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Usually, bigger plants do produce bigger seeds.
Angiosperms are plants that produce seeds enclosed in a fruit.
some plants produce seeds that develop inside of what?
The seed produces another generation of that plant after germination.
Plants
All vascular plants do not produce seeds and fruits, only angiosperms can do it.
If they are plants (e.g. spotted knapweed) they produce seeds to reproduce, because they are plants that produce seeds to reproduce. If they are animals (e.g. brown tree snake) they do not produce seeds, because animals do not reproduce by producing seeds.
cacti are flowering plants and produce seeds
Angiosperms and gymnosperm plant types both produce seeds
Oddly enough they produce guava seeds.