Can someone ! a chemical sequence of dna, or determines a trait of an organism.

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.

365.25 earth days are in the year of a light year