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.
An Ecologist is a scientist who studies ecosystems.
a type of scientist who studies about metal is called metallururgist
what is the scientist that studies motions? A Physicist
A mineralogist studies minerals.
An ecologist studies pollution
meteoroligists
An Ichthyologist.
Audiologist
cosmologists
Botanist
seismologist
a biologist