Which is true ? a. all organisms obtain water through food b. some substances must be dissolved in water before they can be used c. water s important to some organisms d. plant cells are unaffected when water is scarce

Organisms within a population must compete for resources to survive

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

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content