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<span> The process in nature by which, according to
Darwin's theory of evolution, only the organisms best adapted to their
environment tend to survive and transmit their genetic characters in
increasing numbers to succeeding generations while those less adapted
tend to be eliminated.</span>
True, meristem cells are undifferentiated
Similar: Both can spread really fast, as people interact with each other
Different: Airbone diseases are transfered through air, or oxygen, while person-to-person diseases are transfered by people closely interacting. This means that airbone diseases may be able to spread faster, since you arent always able to control what you breathe in