How does the behavior of deep water species affect the balance of life higher up?

Deep sea has species such as archaea that thrive in hydrothermal vents and turn inorganic molecules into organic molecule through chemosynthesis. This provides the start of the food chain that ends up higher up the waters. Also in the deep oceans are scavengers that feed off dead fish that sink to the bottom of the ocean. They help recycle these nutrients by consuming the carcasses.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.