The answer is C- Sexual Production.
The evolution can be defined as the change in the features of the species over generations that makes the organism adaptable to the changes that occur in it's physical environment. The evolution is based upon the process of natural selection. The theory of evolution also suggests the fact that all species are related but gradual changes occur in them with respect to time. The evolution brings changes in the heritable characteristics which are the characteristics that are passed from the parents to the offspring during reproduction.
Explanation:
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.