Which choice best expresses what the reader learns about the narrator in paragraphs 2 and 3? A
That his specialty is infectious laughter
B
That his job is very tiring
C
That bad comedians value his services
D
That he is very good at his job

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:

trig 15.3 cos

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.