"There is a line that starts in northeastern Washington and then travels approximately along the border of Washington and Idaho and the border of Oregon and Idaho. This line separates two areas that have different values of Strontium 87. Strontium 87 is an isotope that is stable, meaning it is no longer radioactive. Its parent material is Rubidium 87. Rocks east of this line have a much higher concentration of Strontium 87, while rocks west of this line have a low concentration of Strontium 87. Explain why this occurs."

Aresearcher proposes to conduct a study at a foreign site. the research has been determined to be exempt from the federal regulations by institutional policy. according to federal regulations, is review required at the foreign site? if a proposed study qualifies for exemption, federal regulations do not require review at the foreign site where it will be conducted but still require review at the u.s. site by the institution’s irb. if a proposed study qualifies for exemption, federal regulations do not require review at the foreign site where it will be conducted. if a proposed study qualifies for exemption, federal regulations do require review at the foreign site where it will be conducted. if a proposed study qualifies for exemption, federal regulations do not require review at the foreign site where it will be conducted, but still require review by the institutional official at the local site.

The united states economy is one in which producers are generally free to produce what they want and consumers are free to purchase what they desire, so long as no laws are broken. at the same time, however, the government does regulate some aspects of the economy. the u.s. can best be described as which of the following a mixed economy b liberated economy c command economy d market economy

Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?