The selective reduction of oxygen to water in such biological systems is crucial, not only in order to maximize the energy produced for cellular metabolism but also because hydrogen peroxide is a powerful oxidant and cytotoxin, which harms living cells.
AAA |. How much a fixed asset is worth at the end of its lease, or at the end of its useful life. If you lease a car for three years, its residual value is how much it is worth after three years. The residual value is determined by the bank that issues the lease before the lease begins. It is based on past models and future predictions. It is an important factor in determining the car's monthly lease payments (the other factors are the interest rate and tax).
The banks that issue the lease contracts set residual values. The residual value is their best guess as to what the car will be worth at the end of the lease. They base their projections on data from past models and a prediction of what consumer tastes will be. In most cases, you can't negotiate the residual value.