Answer:
i believe it would be the last one "screens remove solid debris, grits and sand"
Explanation:
Producers-> Herbivores (Secondary Consumer)-> Primary Consumers-> Tertiary Consumers
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.
