What happens if a cell successfully completes the g1 phase?

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?