Question

1. We see the lighting flash before we hear thunder.
2. Sniffer dogs are used hwno lice todot
datort crima​

Answer 1

Explanation:

Well I'm not getting the second one but for the first one I guess you need the reason why we hear the sound after the lighting flash. It's just because the speed of light is far more than that of sound in air. Therefore the flash is seen before the sound reaches our ear.