A cell is the basic unit of living things. All living things are made up of cells which carries out the biochemical reactions which are needed to keep living organisms alive. The number of cells in different living organisms differ. Some organisms have only one cell and they are called unicellular organisms while some have many cells and they are called multi cellular organisms.
You need to give some of the options that are given to you
An overweight person is highly susceptible to disorders like heart problems or stroke, high blood pressure, diabetes even some breathing problems such as sleep apnea and asthma
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