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.
Most frequently, stress will cause side-to-side lines to appear on your nails. 2. Moles or melanoma. A concern about nail color is one of the most common complaints dermatologists hear, Dr. Poblete-Lopez says. Discolorations usually appear in lines that run from cuticle to tip, and they can be benign moles or cancerous melanomas.