PLEASE HELP IM TIMED Which method of moving materials in and out of a cell requires energy?

1.active transport
2.passive transport
3.osmosis
4.diffusion

Define production possibility curve

Why is it economically necessary for the east germans to build berlin wall

All of the following statements point out negative aspects of the gilded age except: a. politicians gave government jobs to political supporters. b. political bosses cheated large cities out of millions of dollars. c. industrialists bribed members of congress to ensure favorable votes. d. in 1903, wisconsin became the first state to hold primary elections.