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A Dermatologist is a doctor that deals with skin and skin disorders. Skin is the main organ of the Integumentary System, so Dermatology would be a nominee for this kind of career.
A vetrinarian
A cardiologist studies and treats the human heart. Another name for a heart doctor is a cardiologist.
The kind of scientist who studies Urology would be a Biologist, since Urology concerns a biological function (urination). If you mean the kind of doctor who studies Urology, that would be a Urologist.
astronontist
Astronomy is the study of the Solar System. Planetary Science, or a Planetologist, studies the planets.
A urologist.
Hematoligist
A Urologist.
a pulmonologist.
A mineralogist studies minerals.
An ecologist studies pollution