The answer would be: White blood cell (WBC) count of 20,000/mm3
Peritoneal dialysis is an invasive treatment that involves an injection of fluid to the peritoneal space. It has a high risk of infection, which could cause peritonitis. Increases of white blood cells is a sign of infection. Peritoneal dialysis needs to be stopped if the infection occurs.
I believe the answer to this question is (D) habitat fragment. Habitat fragmentation is the process in which the loss of habitat causes a division in a larger habitat, resulting in smaller areas that are isolated from each other. In this the tigers are separated from other inhabitable nearby areas.
Reduction in the amount of energy consumed in a process or system, or by an organization or society, through economy, elimination of waste, and rational use. (e.g. turning lights out when you leave the room)
Description 2 describes a commensal symbiosis. The answer is D, commensalism.