a dense population, adapt to the environment, an endangered animal, be allergic to, be good for mental health, be in good health, be infected with a virus, be short of, car exhaust, care for the handicapped, cause an abnormal climate, cause damage to the environment, come down with, conduct medical research, consume energy, consume natural resources, conserve the environment, cure someone of a disease, a desperate food shortage, develop medical technology, purify polluted air, receive sufficient nutrition, recover from an illness, relieve overpopulation, run out of resources, save tropical rainforests, stay in shape, sustainable energy resources, take medicine, urban sprawl.

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