We call this a ‘life cycle’ because it happens over ... We call this ‘Photosynthesis’. At the plants adult stage flowers start to grow, moving pollen from the stamen to the stigma produces ...

fill an approximately 25-million-year gap in knowledge by reconciling the molecular clock—or pace of evolution—with the fossil spore record—the physical evidence of early plant life gathered by ...

and programmed senescence in annual plants (Roach 1993). The overall impact of predictable variation on life histories is the evolution of additional life stages and potentially complex life cycles.