Which of the following examples shows that a chemical reaction has occurred? O A solid is formed when heat is removed from a sample of water.
A rock breaks into smaller pieces when it is struck with a hammer.
O A cup of water turns pink when a few drops of red food coloring are added.
Bubbles form when baking soda is added to vinegar and mixed.

we need to know the time interval during which the force acts. impulse of force = momentum change

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.