wear+and+tear
131Cross-country equestrianism — For information on other aspects of this discipline, see Eventing and Cross country obstacles. For the athletic competition, see cross country running. A cross country competitor Cross country equestrian jumping is an endurance test, and is one… …
132Evolution of ageing — Enquiry into the evolution of ageing aims to explain why almost all living things weaken and die with age. There is not yet agreement in the scientific community on a single answer. The evolutionary origin of senescence remains a fundamental… …
