ans is A +BC → AC+ B
a single element, B, is displaced in the reaction by another element, A. so its a single displacement reaction
One of the lab safety rules being violated is that Jodi doesn't have her hair tied up. She should have her hair tied up. Having her long hair not tied up or away from her face is a safety hazard. Jodi is also not wearing glasses, which is essential when working with chemicals. One of the Bunsen Burners aren't being used but it's on, which is a fire hazard.
A) Nucleus
The nucleus of a biological cell contains the genetic information that is used to create the proteins within the cell, and, in the case of multicellular organisms, proteins outside of the cell as well. This is why the nucleus contains the "identity" of the cell since it has all of the information required to create the cell. Therefore, the nucleus provides the unique characteristics.