Endocrine structures are the system that has glands to produce and release hormones. Testicles are the male organs that are an example of endocrine structure. Thus, option a is correct.
The endocrine structure includes the glands responsible for producing and releasing chemical messengers. Testicles are the male organs controlled and regulated by the pituitary gland. They release testosterone to produce sperm.
Therefore, the testicle is part of the endocrine structure.
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