Which of the following is an example of how a scientist might use a model?
a.)a stopwatch is used to time the rate of a chemical reaction
b.)a microscope is used to magnify a group of cells on a slide
c.)the end of a slinky is moved vertically up and down to stimulate a wave
d)a wrench is used to tighten a nut onto a piece of wood

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali

the romans were initially interested in expansion via sicily (which at that time was a cultural melting pot), part of which lay under carthaginian control. at the start of the first punic war (264-241 bc), carthage was the dominant power of the western mediterranean, with an extensive maritime empire