Suppose ? Is a Real Parameter $\alpha$
B) The a Real

Multiple Choice

Suppose ? is a real parameter. Consider this competing species model:

Which of these are true? Select all that apply.

A) The origin is a critical point of this system for all values of $\alpha$ .
B) The $x$ -nullcline is the curve $\frac{6}{3} x^{2}+\frac{4}{3} x$ .
C) The $y$ -nullcline is the horizontal line $y=\frac{2}{7} \alpha$ .
D) The system has no critical points for values of $\alpha<-\frac{7}{9}$