#1. another name for unicellular organisms that dominated earth up to the precambrian time is a. eukaryotes. b. cyanobacteria. c. stromatolites. d. prokaryotes. #2. the greenhouse effect is related to the phenomenon of an increase in average surface temperature known as a. air pollution. b. agricultural improvement. c. global warming. d. conservation. #3. which colorless and odorless gas, produced by radioactive decay of uranium-238, is considered to be a cancer-causing agent? a. oxygen b. hydrogen c. boron d. radon.#4. scientists can determine if oxygen existed in earth's archean atmosphere by a. determining how many people survived. b. looking for oxidized iron in rocks. c. looking at the amount of salt content in rocks. d. determining the lack of oxidation that occurred.

Which group is noted for the independence of gametophyte and sporophyte generations from each other? a) ferns b) mosses, hornworts, and liverworts c) charophytes d) angiosperms e) gymnosperms

Competition occurs between species when

He did not infringe upon the policy making powers that he felt the constitution gave congress. but the determination of foreign policy became preponderantly a presidential concern. when the french revolution led to a major war between france and england, washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-british. rather, he insisted upon a neutral course until the united states could grow stronger. which provides the best objective summary of this excerpt? president washington made a good choice when he decided not to accept the recommendations of his advisors and instead insisted that the united states stay neutral during the war between france and england as president, washington believed that the united states should remain neutral in foreign policy even though he had advisors who recommended that he take sides during the war between france and england. washington did not make policy decisions during his presidency because he did not want to interfere with the policy-making powers that the constitution gave congress. washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-britis