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.
Mees lines are an uncommon cause of white lines on the nails. They are tiny breaks in the nail, which move up the nail as it grows. Mees lines also run horizontally across the nail, but they may or may not extend the whole way from one side to the other. Mees lines do not disappear when the nail is squeezed.uehrcke Lines. In some instances, white lines on the nails appear as a pair of parallel lines that run horizontally across the nail, from one side to the other. These lines -- known as Muehrcke lines -- stay in the same place and do not move when the nail grows.