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.
Sympatric speciation occurs when populations living in the same. geographical region, become reproductively isolated. Factors such. as chromosomal changes (polyploidy), asexual reproduction, and. non-random mating can alter the gene flow. This type of speciation. is more common in plants than in animals.