What’s the difference between the cardiovascular system and lymphatic system

The lymphatic system is composed of lymphatic vessels, which are tubes that assist the cardiovascular system in the removal of tissue fluid, also known as lymph, from the tissue spaces of the body. the vessels then return fluid to the blood within the circulatory system.the circulatory system is composed of arteries, veins, and capillaries. 

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.