Plankton is not the name of a plant or animal but more of a category for any drifting organism that inhabits the middle to upper levels of the ocean, namely the pelagic zone.
Most vets do spays, neuters, bone surgeries, spleen surgery, tumor removals, and intestinal surgeries. Heart surgery and more complicated surgeries are done by specialists that requires more schooling. If you want to be a vet, you have to have REALLY good grades and Vet school is MUCH harder to get into than human medical school.
The medical supplies that veterinarians use to treat animals are similar to those that doctors use on human patients. These include otoscopes and ophthalmoscopes for examining the throat, ears and eyes, and aspirators and regulators for surgical procedures. Vets use other kinds of tools depending on the patients ...