What are some ways an asteroid’s orbit can be altered?

If it has a magnetic field, then you can make a stronger magnet and pull it away from it's current course.

reserve is the answer

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.