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.
Other causes of vertical ridges Other conditions may also cause vertical nail ridges along with other symptoms. Some types of anemia may influence vertical ridges in the nails, often accompanied by color changes in the nails or changes in texture. Anemia can cause vertical ridges to appear and may also make dents appear in the nail. A splinter hemorrhage is a tiny blood clot that can create a vertical discoloration beneath the nail. If the person does not know what caused the bleeding from the hemorrhage, they should consider a trip to the dermatologist.