The population growth curves are given below. Identify the equations for $P$ and $Q$.

• A
  $\frac{dN}{dt} = rN \left(\frac{K - N}{K}\right) \quad \frac{dN}{dt} = rN$
• B
  $\frac{dN}{dt} = rN \quad \frac{dN}{dt} = rN \left(\frac{K - N}{K}\right)$
• C
  $\frac{dN}{dt} = rN \quad \frac{dN}{dt} = rN \left(\frac{N - K}{K}\right)$
• D
  $\frac{dN}{dt} = rN \left(\frac{N - K}{K}\right) \quad \frac{dN}{dt} = rN$