This problem is for A-Level and IB, and it is not in the NEET syllabus…

In predation, the predator gains and the prey is harmed. Predators carry energy, control the prey and keep species diversity. Prey defend with camouflage, poison and warning colours, thorns and chemicals. The balance point of the Lotka-Volterra equations $\dfrac{dx}{dt} = ax - bxy$ and $\dfrac{dy}{dt} = cxy - dy$ is $x = d/c$ and $y = a/b$, and the swings have the period $2\pi/\sqrt{ad}$.