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 veterinarian job description includes: 1  Diagnose and treat animals with illnesses and injuries. 2  Dress animal wounds. 3  Carry out surgical operations on animals.  Vaccinate animals against 1  infections. Treat animals with fractures.  Operate medical equipment used in animal treatment, such as CT-scan and urinalysis.