Yes; testing material B before testing material A, however, would have invalidated the results.
hope this helps :)
1. wear safety glasses
2.never touch heating source
3. keep away from overhead shelving
Answer:
I think ans is no.c or other else
<span>It traps emissions close to Earth’s surface due to the Inversion Layer (Warmer air) being trapped between two colder air pockets having no where to go, and in effect the emissions also cant go anywhere because they are also trapped by the layers</span>