The excretory system is responsible for moving toxic wastes, dissolved molecules, and excess heat. you would conclude that the excretory system contributes to:

The excretory system is responsible for moving toxic wastes, dissolved molecules, and excess heat. You would conclude that the excretory system contributes to: Maintaining dynamic equilibrium in the body.

Explanation:

Living cells carry out chemical reactions, necessary for their functioning. These generate several substances, some of which are unwanted by-products and can give the organism if they accumulate. That is why they have developed special mechanisms for the elimination or excretion of these residual products. Excretion is the process by which the body removes metabolic wastes from the body. The excretory system is the set of organs and ducts of the body responsible for the elimination of waste products from the body. Among the substances that the human body must eliminate are carbon dioxide (from cellular respiration), bilirubin (which comes from the degradation of red blood cells), salts, water and urea (product of protein degradation ). These substances are processed in various organs. Excretion processes are important for homeostasis, that is, the maintenance of a constant internal environment (dynamic equilibrium) for body cells.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.