Rapamycin was heralded as a drug with substantial promise and first isolated from a soil sample at select one: a. fda b. ayerst laboratorie c. nih d. elysium

 The correct answer is :  b. Ayerst Laboratorie

Explanation:  Samples were taken from several plots of the soil of Easter Island. In 1969, all samples were delivered to the Ayerst research site in Montreal. It was there that they discovered that there was a bacterium that had the ability to produce rapamycin, which is a compound that has many medicinal properties.

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.