Which puppy might have been placed into this litter by mistake

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Models are non-visual ways of coummincating how someone thinks about something in the natural world

How does an angiosperm prevent self pollination