For the differences between chemistry and physics see comparison of chemistry and physics. The history of chemistry can be traced to alchemy, which had been practiced for several millennia in various parts of the world.
Experts agree that it is not the laws that are deficient in Argentina; rather, it is repeated failures to enforce current laws. With the added internal conflict of the 2001 economic crisis, the struggle to balance economic growth and environmental preservation is a major challenge.he following statistics give perspective to the ongoing environmental sustainability situation in Argentina: 1  Disappearances of Forests: In 1914, there were 105 million hectares; since 2005 there is an estimated 33 million remaining hectares of forest.
Princeton's WordNet(5.00 / 1 vote)Rate this definition: 1  challenge(noun) a demanding or stimulating situation. they reacted irrationally to the challenge of Russian power. 2  challenge(noun) a call to engage in a contest or fight. 3  challenge(noun) questioning a statement and demanding an explanation. his challenge of the assumption that Japan is still our enemy. challenge(noun) a formal objection to the selection of a particular person as a juror. challenge(verb) a demand by a sentry for a password or identification.