Safer - yet- effective alternatives remain elusive. Ironically, the idea that pyrethroids are safer that DDT is unproven. Almost no studies on health risks of pyrethroids exist; thus, we cannot guarantee their safety. We can, however, guarantee the spread of malaria without DDT. Why does Velasquez include the detail about the lack of studies about the health risks of pyrethroids?

a. to emphasize the danger of allowing malaria to spread.
b. to highlight that the world needs safer malaria preventions
c. to clarify why some nations have to fight malaria using DDT
d. to strengthen the case for using DDT to prevent malaria

Armed with invisible ink, a cipher system, and a passion to end the war and preserve the union, elizabeth van lew became butler's eyes and ears in the confederate capital city. truth be told, however, she became much more than that. she became a spymaster, the person responsible for running a network of agents, couriers, and safe houses that was very active during the war. in addition to the spying, elizabeth van lew continued to maintain her church hill home as a safe house and something of a local union spy headquarters. —the dark game, paul janeczko what is the central idea of this passage? van lew’s home was used as a safe house, which was critical to the confederacy. van lew had a passion to end the war and preserve the union. van lew was a spymaster, a leading force in the espionage activities for the union. van lew did not enjoy working for general butler.