4 A car horn has a frequency of 400 Hz. The car is moving away from an intersection at 8 m/s. The frequency heard by a woman standing at the
intersection could be

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:

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.