It is use by Eye Care Professionals To check the eyesight of a person.
If u would have visited a eye care centre u would have noticed a chart like this--
If a person can see all the letters from a distance his eyesight is Perfect.If that person misses a letter or a line from the grid eye treatment or spectacles are given to the person for improving their eyesight
Answer:
They have too much times on their hands so they go and annoy others to keep themselves busy and distracted. They also are very curious about everything and they let it take over them so all they do is try to explore things and ask questions which leads them to come off as annoying.
Your spinal cord is protected by the vertebral column (also known as the spinal column or backbone). The human spinal column is made up of 33 bones - 7 vertebrae in the cervical region, 12 in the thoracic region, 5 in the lumbar region, 5 in the sacral region and 4 in the coccygeal region.
HIV is the virus that causes <span>acquired immune deficiency syndrome (AIDS)</span>
The wasting away of is referred to as Muscle Atrophy.