An increase in phosphate levels in a lake increases the population of algae in the lake. increased algae blocks sunlight into the lake and results in a decrease in dissolved oxygen in the lake's water. which of the following should be expected as a result? plant populations in the lake increase more predatory birds feed on lake animals phosphate levels in the lake decrease fish populations in the lake decline

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

What are the characteristics of subsystem

Earth is tilted on its axis. which of these would not exist if earth had no tilt?