It is crucially important to farmers that the herbicides they use to control weeds not damage their crops. one very effective herbicide is safe for corn but lethal to soybeans. to maintain the nutrients in the soil, soybeans and corn are frequently sown in a field in alternate years. therefore, in such fields, the herbicide can safely be used on the corn, since the two crops are not sown together in the same field. which of the following, if true, most seriously weakens the argument? (a) the herbicide has not been shown to harm insects, birds, or other animals that come in contact with it.(b) scientists have so far failed in their attempts to breed soybeans that are resistant to the herbicide.(c) some of the herbicide persists as a residue in the soil for over a year.(d) to be effective, the herbicide must be applied early in the growing season of the corn.(e) soybean crops do not require the application of herbicides to the same extent as do corn crops.

The persians landed in the plains near athens. as their army greatly outnumbered that of the greeks, the greeks hoped to find aid from nearby sparta. a long-distance runner named pheidippides was sent from athens to sparta to request , but the spartans were not able to send more soldiers at the time. regardless, the greeks were still able to win the battle. centuries later, legend developed that a runner had been sent from the battle to athens after the greek victory. after reaching athens, the runner proclaimed, "we are victorious! " and then fell to the ground and died. this legendary story is the inspiration for the modern long-distance runs that are performed today. this passage refers to the events of which battle during the persian wars? a. battle of thermopylae b. battle of salamis c. battle of plataea d. battle of marathon

The colors at sunset are usually the result of raindrops

Voters commonly condemn politicians for being insincere, but politicians often must disguise their true feelings when they make public statements. if they expressed their honest views—about, say, their party's policies—then achieving politically necessary compromises would be much more difficult. clearly, the very insincerity that people decry shows that our government is functioning well. which of the following, if true, most seriously undermines this reasoning? (a) achieving political compromises is not all that is necessary for the proper functioning of a government. (b) some political compromises are not in the best long-term interest of the government. (c) voters often judge politicians by criteria other than the sincerity with which they express their views. (d) a political party's policies could turn out to be detrimental to the functioning of a government. (e) some of the public statements made by politicians about their party's policies could in fact be sincere.