The declination of Procyon is 5 degrees on December 1. On December 10, it’s declination will be A.10 degrees, since 5 days have passed
B.20 degrees, since stars change their declination by 4 degrees each day
C. 0 degrees, since the declination is reduced by 1 degree every day
D.5 degree since the declination of stars does not change

where's the following? you gotta add it to know what the choices are

explanation:

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:

this is poiselle's equation from fluid mechanic in physics. mech eng

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray