This human reproductive system diagram depicts the biological process of producing a new individual or offspring identical to the parents. When conditions are favorable, this process ensures that the number of individuals in a species increases. Every human being has a sexual mode of reproduction. Two parents are involved in producing a new individual in this process. Each parent's fusion of gametes (sex cells) results in offspring. As a result, the newly formed individual will be genetically and physically distinct from the parents. Human reproduction is the best example of sexual reproduction, as illustrated in this human reproductive system diagram.