The ecology of a site is changed through its colonization by new plants that arrive and grow there. A. The species that first colonize a disturbed site are typically ones that produce a large number of efficiently dispersed seeds. B. Plants that cannot successfully compete with other species can invade and colonize a site only if it is fertile and moist, such as a plowed field. C. Pioneer species arrive at a site first but have lower survival rates than do species that arrive later. D. Producing seeds that germinate at various time over long periods allows some plants to colonize sites that only occasionally present the right conditions for growth. E. Large, long-lived seeds tend to result in large seed bank with short germination periods requiring favorable environmental conditions for development. F. The successive appearance and disappearance of species on a site is a result of variation in species' rates of invasion, growth, and survival.