What is the main function of the reproductive system?

The major function of the reproductive system is to make sure that the human species survives. It is not necessary for every human being to produce children, but in order to continue our human species, at least some people have to have children. The four main functions of the human reproductive system are: To produce egg and sperm cells, to transport and sustain these cells, to nurture the developing offspring, and to produce hormones.
All of these functions are divided by their primary and secondary, or accessory, reproductive organs. 

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When measuring an earthworm you would most likely have to go with centimeters

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