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 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.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.