1)In the first paragraph, the writer says that the nano-spider Als much thicker than a human hair.& cannot be seen under a microscope.C was invented by an individual scientist.D is an extremely small machine, 2. Why does the writer suggest nano-spiders can be classified as robots?A because they have the features of a robotB because they can walkC because they are built with computer chipsD because they are microscopic devices3. What does this refer to in 1. 307A the number of steps DNA walkers can manageB the walking distance a DNA walker can doCthe length of the DNA walkersD the time each step takes for a DNA walker​