A hard rubber comb is pulled through a student's hair, and acquires a negative electric charge. This must mean that ---. Question 2 options:

the comb is electrically connected to the ground

the comb is taking electrons from the hair

the hair is taking protons from the comb

the comb is creating electrons

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: b.

explanation:

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle