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.
In rare instances, vertical toenail ridges can be a sign of poor nutrition or a lack of certain vitamins or minerals in your diet. Some diseases or even nail injuries can also cause vertical toenail ridges. If there is a single vertical ridge, it may be a cause for concern. Furthermore, if vertical toenail ridges are accompanied by symptoms like brittle nails, jagged edges, or splitting, you might have a condition known as onychorrhexis. Beauâs Lines