I would go with the first option
<span>Sterilization of animals reduces the level of circulating reproductive hormones leading to increased longevity, typically due to reduce cancer mortality. The primary aim of animal sterilization is avoiding overpopulation, but this increased longevity could be an added benefit for an individual animal.</span>
To make two daughter cells, the contents of the nucleus and the cytoplasm must be divided. The mitotic phase is a multistep process during which the duplicated chromosomes are aligned, separated, and moved to opposite poles of the cell, and then the cell is divided into two new identical daughter cells. The first portion of the mitotic phase, mitosis, is composed of five stages, which accomplish nuclear division. The second portion of the mitotic phase, called cytokinesis, is the physical separation of the cytoplasmic components into two daughter cells.
<span>Bariatric surgery is a surgery created to help one lose weight. The set-point theory says that the body’s regulatory controls help a person maintain a specific body weight as time goes on. Bariatric surgery works to establish a new set-point by altering body weight and establishing weight loss results.</span>
Turning off the switch breaks the electrical current to the light - no supply of energy, the light goes off.