Check all the statements that are true for BOTH T cells and B cells. 1. The cells have a specific protein receptor in their membranes.
2. uses cells to defend against pathogens
3. regulates the production of plasma cells
4. when activated, make millions of clones of themselves
5. uses antibodies to defend against pathogens
6. can bind with free-floating antigens
7. form memory cells to provide protection against future attacks by the same
pathogen
8. responsible for regulating the immune system
9. produced in bone marrow
10. mature in the thymus

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