Emily enjoys experimenting with color changing lizards. she places a green lizard on a brown background and a brown lizard on a green background. emily knows the green lizard should turn brown and the brown lizard should turn green. neither lizard changes color. which is what may have caused emily's results? a. other factors may be affecting the color change like fear or temperature. b. the lizards had to choose to move to the new background for the effect to take place. c. more time should be allotted to allow for the color change to take place. d. the backgrounds may have been the wrong shade of color for these specific lizards.

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

Fredrick griffith made a scientific discovery in 1928

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil