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.
Vertical nail ridges. Vertical nail ridges are fairly common and nothing to worry about. Vertical nail ridges extend from the cuticle to the tip of the nail. Vertical nail ridges often become more numerous or prominent with age, possibly due to variations in cell turnover within the nail.If your fingernails change color or you develop horizontal nail ridges, consult your doctor.These changes could indicate an underlying health condition. With. Lawrence E. Gibson, M.D. 1  Nail biting and long-term damage. 2  Split fingernails.ertical nail ridges often become more numerous or prominent with age, possibly due to variations in cell turnover within the nail. If your fingernails change color or you develop horizontal nail ridges, consult your doctor.