With the invention of the ancient people of the writing system began period (prehistoric, historical).

ahihi

Explanation:

ápaánlaà3  

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.