Bifurcations and bifurcation diagrams

We consider the differential equation $\frac{\dd y}{\dd t}=f(y,b)$ where $f$ is some function and $b$ a parameter. The figure below shows the graphs of the right-hand side of the differential equation as a function of $y$ for four different parameter values, namely for $b=-10$ , $b=-4$ , $b=2$ and $b=10$ . For values of $b$ between $-10$ and $10$ the functions change neatly so that the graphs will always lie neatly between the graphs shown.
faseportretten

Which bifurcation value, named $b^{\ast}\!$ , can be deduced from the shown graphs?
$b^{\ast}={}$

The number of equilibria changes in the bifurcation:
for $-10\le b< b^{\ast}$ the number of equilibria is equal to

for $\phantom{-}b^{\ast}\lt b \lt 10$ the number of equilibria is equal to

Select the right elements from the following drop-down menus so that you finally get the phase line of this differential equation.at the bifurcation value $b^{\ast}\!$ .

Ordinary differential equations: Bifurcations

Bifurcations and bifurcation diagrams