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.
The simple answer to what fingernail lines may indicate is that they are very often insignificant. This is especially true when it comes to the vertical lines on the nails, which may start at or just above the moons or cuticles and extend upward to the nail tips. Horizontal fingernail lines may be more suspect, but even here, the lines may be nothing and could be a sign of age or behaviors. There are some worst-case scenarios, on the other hand, that may be worth considering. Most people have vertical fingernail lines and these can be light or have grooves.