In an ecosystem containing the food web shown, one eventual result of a program by farmers to get rid of field mice might be a. decreased amount of grasses. b. decreased number of rabbits. c. increased number of weasels. d. no change in the number of rabbits.

Which type of bacterial reproduction is depicted in the diagram?

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

20 the compound al(nh3)2 has atoms of nitrogen.