In order for organisms to stay alive, what are some of the essential chemical substances that must be able to enter and leave cells? Check all that apply. water
oxygen
Glucose/sugar
soil

Which of the following birds remained ancient looking in the miocene epoch? a. crows b. owls c. grouses d. none of the above

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

Identify the area on the image where the force of attraction is the strongest.