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.
Iron deficiency anemia can also trigger vertical ridges and changes to your nails that make them concave, or spoon-shaped. Horizontal ridges. Deep horizontal ridges, called Beauâs lines, are often symptoms of a serious condition. They may actually stop nail growth until the underlying condition is treated. Acute kidney disease may also be present if Beauâs lines appear.