How is a warm front different from a cold front? Warm fronts cause snow flurries in the winter, while cold fronts cause several days of rainy weather.
Warm fronts cause rapid changes in weather, while cold fronts cause several days of cloudy weather.
Warm fronts cause several days of cloudy weather, while cold fronts cause heavy snow in the winter.
Warm fronts cause thunderstorms in the summer, while cold fronts cause rain when the air is humid.

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

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

Tom wants to conduct a scientific study but he needs to finish by the end of the school year. what practical way could tom work around this limitation and be successful in his study?