Which of the following most likely happens when the temperature of a chemical reaction is increased? molecules speed up? molecules stop reacting? reaction rate decreases? chemical reaction stops?

A molecules speed up because the temp is rising there for the molecules speed up

hope this helped =^-^=

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.