An oil spill happened at the wild harbor salt marsh on cape cod, massachusetts in 1969. the oil has persisted in the ground since then. how is the green crab used as evidence for the idea that oil still exists in the lower layers of the soil? these organisms show increased reproductive rates compared with previous rates. these organisms show increased predation on other species than prior to the spill. these organisms dig more shallow burrows than they used to. these organisms migrate to deeper waters than they did before.