Approximately 2 million years ago the genus australopithecus gave rise to a new genus, homo. today, we retain the genus as homo sapiens. what important fossil evidence most likely scientists change the classification of those early human ancestors? a) opposable thumb b) teeth and skull size c) pelvis and leg bones d) spine alignment and foot size

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area