According to the law of conversion of matter, which chemical equation represents a possible chemical reaction

a. 2Na+ Cl2=2NaCl is the most possible chemical reaction that can occur

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.