<span>Wetlands help reduce erosion through B. sediment trapping.
Soil and rocks are trapped and then there is no erosion or crumbing of the ground and rocks.
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On one side of the grand canyon could be a squirrel with a birth defect witch reproduses with a squirrel with normal genes. But the birth defect is stronger than whatever trait that may be. so the litter of squirrels mostly have this trait. and the cycle contiues
She can do an experiment by purchasing the top soils she think will work. Then she must take care of each plant exactly the same way. the only thing that will be different is the soil. If she waits for a couple of weeks she can observe each flower and see which one turned out best and use that soil that was used in her best flower.