Zaki Marzog Al-Aofi2022-05-192022-05-191131https://drepo.sdl.edu.sa/handle/20.500.14154/9753In this thesis we discussed different models of predator-prey systems. Our main results are concerned with qualitative properties of solutions of the general 2 dimensional model. The obtained results improve and partially generalize some of those recently published in the literature.enThesis