1 If the black lines aren't visible on the external screen, the laptop screen may need to be replaced. 2  If the black lines are also visible on the external screen, the video card or motherboard may need to be replaced. 3  In some cases, a loose video card can cause problems with the monitor video.
1. segmentation - (embryology) the repeated division of a fertilised ovum. cleavage. embryology-the branch of biology that studies the formation and early development of living organisms. cell division, cellular division-the process in reproduction and growth by which a cell divides to form daughter cells.
Vertebrates have a segmented vertebral column and brain. Segmentation in biology refers to the division of some animal and plant body plans into a series of repetitive segments. This article focuses on the segmentation of animal body plans, specifically using the examples of the phyla Arthropoda, Chordata, and Annelida.These three phyla form segments by using a âgrowth zoneâ to direct and define the segments.his article focuses on the segmentation of animal body plans, specifically using the examples of the phyla Arthropoda, Chordata, and Annelida. These three phyla form segments by using a âgrowth zoneâ to direct and define the segments.