1) This is a model of a lithium atom. The red and blue subatomic
particles found in the nucleus are the
and
The
sum of these subatomic particles equals the atomic
A)
protons and neutrons, mass number
8)
protons and electrons; mass number
C)
protons and neutrons; atomic number
D)
protons and neutrinos, identification number

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 why biological control methods are generally environmentally superior to chemical pest control methods.

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.