One parrot species that feeds on large seeds nests is in the same tree as a parakeet that feeds on small seeds. how are the birds able to coexist?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

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

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation