Evolution is often depicted as a steady forward march from simple to complex forms. But new research shows that certain ferns can evolve ‘backward.’ ...
Evolution is often depicted as a steady forward march from simple to complex forms. But new research shows that certain ferns can evolve “backward” ...
But ferns are an important exception. Ferns have multiple reproductive strategies. Most species combine spore development and photosynthesis on a single leaf type – a strategy called monomorphism.
(Laurenprue216/Wikipedia /CC BY-SA) Across the plant kingdom, once species evolved reproductive structures such as seeds, cones and flowers, they did not revert to simpler, undifferentiated forms.