If you're Rh-negative and your baby is Rh-positive, your body will react to the baby's blood as a foreign substance. Your body will create antibodies (proteins) against the baby's Rh-positive blood. These antibodies usually don't cause problems during a first pregnancy.
One point perspective definition. One-point perspective is a type of linear perspective. All categories of linear perspective include a horizon line and a stationary point (the position of the observer). In one-point perspective, only one vanishing point exists; lines radiate outwardly from this point, and perpendicular lines meet at this point. One-point perspective is the same as parallel perspective.
Oddly, this meaning of perspective is primarily used outside of art. So the most general definition of perspective is a position in relation to different positions.. For example, this includes the position of our eye in relation to the positions of objects in a scene. Applying this to art, we do not necessarily mean the viewpoint of the artist in relation to the subject.