What does the term "fitness" refer to according to Darwin?

Step-by-step solution

Conventional religious literature tells us about the theory of special creation. This theory has three connotations. One, that all living organisms (species or types) that we see today were created as such. Two, that the diversity was always the same since creation and will be the same in future also. Three, that earth is about 4000 years old. All these ideas were strongly challenged during the nineteenth century.Those characteristics which enable some to survive better in natural conditions (climate, food, physica