I think it is because it is directly about the north or south pole (I forget) so while all the other stars seem to rotate around because the Earth is rotating but the North Star is directly in the center. Don't take my word though.
BB = donut body
Bb= donut body
bb= bacon body
(The punnett square is wrong because both parents are hybrid)
1- First we will get the value of POH from:
PH + POH = 14
and we have PH = 12.01
∴ POH = 14 - 12.01 = 1.99
2- Then we need to get the concentration of OH:
when POH = -㏒[OH]
1.99 = -㏒[OH]
∴[OH] = 0.01 M
now we have the concentration at Equ by subtracting from the initial concentration of OH = 0.24 M
∴ [OH] = 0.24 - 0.01 = 0.23 M
∴ Kb = (0.01)^2 / 0.22977 M
∴ Kb value = 4.4 x 10^-4