Examining a corpse, you find many second instars and a few third instars on the body and moving away from it you find no pupae in the ground within 10 m of the corpse. the average ambient temperature over the past month was 70°f (21.1°c) what is yout estimate of the pmi? a)24and 48hours b)50 and 72hours c)72 and 92 d)100and 125

I don't know maybe 50 and 72 hours?

Since most of flies are in the second and third instar phases, but no pupae were found, the PMI would be between 50 and 72 hours (about 2 to 3 days). So your answer would be B) 50 and 72 hours.

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.

the answer is 75.0%.