Final answer:
The ovaries are included in both the reproductive system and the endocrine system. They produce eggs and female sex hormones, and also have endocrine functions.
Step-by-step explanation:
The organ that is included in both the reproductive system and the endocrine system is the ovaries.
The ovaries are part of the female reproductive system and are responsible for producing and releasing eggs. They also produce the female sex hormones estrogen and progesterone, which are important for the regulation of the menstrual cycle and the development of secondary sexual characteristics.
Additionally, the ovaries have endocrine functions, as they secrete hormones directly into the bloodstream to regulate various processes in the body.