The ability to produce seeds when pollinators or potential mates are scarce is thought to be one of the main advantages of self-fertilization in flowering plants.
(pollinators or potential mates; are; scarce) (The ability to produce seeds; is thought; ) (The ability to produce seeds; to be; one of the main advantages of self-fertilization in flowering plants)
pollinators or potential mates The ability to produce seeds The ability to produce seeds
are is thought to be
scarce
one of the main advantages of self-fertilization in flowering plants