Which statement best explains the results of the experiment?

A. The dark bacteria showed resistance to the drug.

Explanation:

According to the given situation, it is evident from the bacterial culture in the first plate containing the generation 1 bacteria. In generation 1 the bacteria which were exposed to the drug of the type which were resistant as well as non-resistant to the drug. But after successive generations the less resistant bacteria became susceptible to the drug and decline in numbers. Upto generation 20 only the resistant bacteria survived. Those were the dark bacteria.

the correct answer is boyle

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.