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.
The theory behind this is that the gene flow that occurs between members of a species would normally prevent speciation within the main body of populations that make up the species, since gene flow would overwhelm the genetic divergence that tends to result from local selection and local adaptation.