This is because the modern lifestyle we're living and people are living in the US is very taxing and can cause people to feel extremely bad about themselves for prolonged periods of time. Furthermore, it's also possible people/doctors are misdiagnosing depression and saying someone is depressed when he or she actually isn't.
The answer is (d) evaporates.
Urbanization is the term that describes the Richardson family, who was tired of the congestion and crime associated with urban life, and then moved from their townhouse located in the middle of the city<span>to the suburbs</span>
I would guess that the answer would be :'<span>These organisms dig more shallow burrows than they used to.</span>' If the crabs actively dig burrows, as many crab species do, and a layer of oil has persisted in the lower soil strata, it makes sense that the crabs would be reducing the depths of their burrows to avoid contact with the oil. The other possibility is that the crabs might might migrate to deeper waters, but this is less likely because the crabs would be evolved to utilise the intertidal zone.