Question

which organ does an endocrinologist primarily study? lungs skin heart thyroid gland

Explanation:

An endocrinologist is a medical professional who specializes in the study of the endocrine system. The endocrine system is responsible for producing and secreting hormones that regulate various bodily functions. The thyroid gland is a key component of the endocrine system, as it produces hormones that control metabolism, growth, and development. Therefore, an endocrinologist would primarily study the thyroid gland.

Answer:

Thyroid gland