Thomson's contribution to the atomic theory was the discovery that negatively-charged electrons were embedded within a positively-charged "soup". Later on Rutherford performed the gold foil experiment which altered Thomson's contribution. What were the conclusions of Rutherford's Gold Foil Experiment? Group of answer choices a. The atom is made up of mostly empty space with a tiny, dense, positively-charged nucleus. b. The atom is mostly empty space, with negative charge concentrated at the center. c. The atom is mostly empty space, with positive charges spread evenly across it. d. The atom is mostly empty space. No other conclusions could be made.

What two fields of study provide the core information that is used to classify organisms?

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 of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi