The component of the Earth's atmosphere of many gasses, is decreases due to the process of photosynthesis, would be the carbon dioxide component, CO2 gas, as plants and other primary producers, utilize this gas, a product for which is breathed out in plants and animals, to incorporate into the second step of photosynthesis. Ultimately to make sugars, glucose.
The body of water disappears and the area becomes land.
Primary succession is much slower than secondary succession because it begins where there is no soil. It can take several hundred to several thousand years to produce fertile soil naturally. The first pioneer species to colonize the bare rock will probably be bacteria and lichens, which can live without the soil.
