Where might someone use "track changes"

According to anthony platt, author of the child savers: the invention of delinquency, the progressives were not children, but denying them what?

Which of the following would most likely cause a large number of density independent deaths in a population

You find a mysterious, dull substance on the ground and pick it up for a closer look. it is powdery, very light, and soft to the touch. the substance is most likely i. an organic mineral ii. a metallic mineral iii. a nonmetallic mineral i only ii only iii only i and ii i and iii