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.
Ridges on Nail or Vertical Lines on Nails Caused Due To Diseases and Toxins: There are a lot of diseases and conditions which can lead to ridges on nails or other notable abnormality on the fingernails. One of the most worrisome causes being the lung and kidney diseases.