Describe at least two traits that differ between these fossils. (Be sure to describe how each trait appears in the two fossils.)

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

Select the word from the list that best fits the definition the temperature to which air must cool to be saturated

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.