Treatment. There's currently no cure for Parkinson's disease, but treatments are available to help relieve the symptoms and maintain your quality of life. These treatments include: supportive therapies â such as physiotherapy ; medication ; surgery (for some people)
Reinforcement is a necessary requirement for both the parapatric and sympatric theories of speciation. It is the process by which a hybrid zone (an area of contact between different forms of a species) develops into a full species barrier.
When can we say speciation happens? â¢When two populations of one species become sufficiently different so they are no longer the same species (this will partly depend on the species concept that you choose) â¢The divergence of an ancestral species into 2 or more daughter species requires genetic change among populations.