Final answer:
Sarcocystis neurona is the protozoal organism responsible for Equine Protozoal Myeloencephalitis (EPM).
Step-by-step explanation:
The scientific name for the organism that is the cause of the disease EPM (Equine Protozoal Myeloencephalitis) is B. Sarcocystis neurona. Sarcocystis neurona is the protozoal organism responsible for Equine Protozoal Myeloencephalitis (EPM).