It is unclear whether springtails in soil are on balance beneficial to crops or disadvantageous. This can prove very disadvantageous in combat situations. Covert operations are employed in situations where openly operating against a target would be disadvantageous. Thus, outgroups, particularly racial minorities, can be subject to disadvantageous selection processes. Moral philosophers have defined discrimination as "disadvantageous" treatment or consideration. While stellar crowding proves disadvantageous to habitability, so too does extreme isolation. The sources denounce this Athenian supremacy (or hegemony) as smothering and disadvantageous. Such an optimization is not possible, or highly disadvantageous for natural ribosomes. This is the most disadvantageous living arrangement. Historically, being landlocked has been disadvantageous to a country's development. However, a long arm span is mechanically disadvantageous on the bench press. However, commentators noted that doing so would be disadvantageous to Obama. They could, however, be efficient in disadvantageous terrain. The Barbarians, seeing this, attacked anyway, in spite of their disadvantageous position. George C. Williams, John Maynard Smith and Richard Dawkins as selectively disadvantageous to the individual.