You are watching a horror movie. the music changes to the familiar tune you recognize as a prelude to danger. you tense up, your heart rate increases, your breathing becomes shallow, and your mouth is dry. which branch of the nervous system has been activated?

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

In what for do plants utilize nitrogen? why do they need nitrogen?

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