What research method is used in order to establish what causes a behavior? an experiment What is the first step of the scientific method? pose a question In the science of human development, &quot;nurture&quot; refers to: environmental influences.
Vertical lines on one's nails, like those the writer seems to have, are a common phenomenon that often get more pronounced with age. There are many reasons for ridged nails but the most common is aging, says Dr. Phoebe Rich, M.D., FAAD, clinical adjunct professor of dermatology at Oregon Health Science University.
Muehrcke's lines appear as double white lines that run across the fingernails horizontally. The condition is named after Robert Muehrcke, MD. He first described the condition in the British Medical Journal in 1956. Symptoms of Muerhcke's Lines. Muehrcke's lines usually affect several nails at a time. There are usually no lines on the thumbnails.