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.
Dents in the nail called beauâs lines are caused because of malnutrition. Lack of vitamin C could cause hangnails and swollen nail tissues. You could also spot red-brown spots at the end of the nails caused by the deficiency of vitamin C. The lack of B12 in your body can show up in various ways on your fingernail.