Help!!! A large beam has collapsed into a room in which firefighters need to enter. Which of the tools can be used alone is to aid the firefighters in accessing the room?

flat-head axe

crow bar

jumbo bar

pry bar

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

answer; how far out of place which the object finished relative to the starting location;

answerdmitry mendeleyev made a workable classification of the elements