Soil aeration is caused by tree roots grazing animals fertilizers earthworms

earthworms

Soil aeration is a phenomena that is related to the pores present in the soil, these pores allows the exchange of gases by the roots. Roots acquire oxygen from the soil pores from the atmosphere and released out carbon dioxide from the roots leaves the soil from these pores. The earthworms and other insects plays an important role in increasing the soil aeration as these worms are decomposers which feed upon the dead organic matter present in the soil these worms creates bores inside the soil in search of food. The bores helps in exchange of gases within the soil and the external environment.  

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

just go with your heart buddy