How long does the impression of an object present on retina? how eye perceives objects as moving?

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

i believe the answer is a hope it and is correct

there are no atoms