PLEASE HELP what is true about the formation of all igneous rocks? a. all igneous rocks are made from other rocks that have been changed by heat or pressure b. all igneous rocks are made from pieces of other rocks c. all igneous rocks are made very differently d. all igneous rocks are made from cooled magma or lava??

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

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Which could be a pathway of food through an ecosystem