which level of organization is characterized by a group of cells that work together to preform a common function?

The process by which natural forces move weathered rock and soil brim one place to another is called

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 zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone