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.
Vaertical Ridges. Many nail blemishes produce the appearance of vertical ridges on the nails; however true vertical ridges on the nails are harmless. According to the Mayo Clinic, vertical ridges may result from injury to the nail bed or plate and can become more apparent with age, as can white spots and lines.