What is one example of a closed economy?

a barter system that does not rely on money or other currency
a restricted system that blocks trade with international partners
a trade-based system that encourages the flow of goods and services
an old-fashioned system that preserves traditional choices and customs

Even before world war ii had ended, it was apparent that the allies would not remain friends in the post-war era. describe how the conflict between the superpowers manifested itself in the two following region: asia

Running and sleep. sufficient sleep is important for adolescents for both their neural and psychological development. despite this, daytıme sleepiness and poor physical and psychological functioning related to chronic sleep disturbances are common. there is a growing body of evidence that exercise is associated with both better sleep and improved psychological functioning sixty participants were recruited from a high school in northwesten switzerlandthey were randomly assigned to either a running group or a control group, 30 to each group the running group ran every moming for a little over 30 minutes on weekdays for a three-week period. all participants used a sleep log for subjective evaluation of sleep, and sleep was also objectively assessed at the beginning and end of the study using a sleep electroencephalographic device that measured quantities such as sleep efficiency and time spent in the four different sleep phases. running was found to have a positive impact on both objective and subjective measures of sleep functioning what are the explanatory variable(s) and the response variable(s)? (a) outline the design of the experiment (b) (c) here are some more details on the treatment and control groups. all participants arrived at school at 7 a. m., and the running group did two laps on the track and then ran cross countrv in groups of at least four people for 30 minutes the control group remained seated at the track, worked on horpework. and interacted with each other. when the runners returned, all participants prepared for school and ate a breaktast that was provided. iwhy do you think the experimenters had the control group arrive at 7 am interact withdassmates and have breaktast together? explain. do you think having the control eroup do these activities is important for the types of conclusion that can be reached? how?

Middle schoolhistory 5+3 pts 1. the pacific islands formed by coral reefs are called (1 point) a. volcanic. b. reefs. c. atolls. d. plates. 2. what is a reason few people have settled in the interior of australia? (1 point) a. no mineral wealth is in the area. b. land is too expensive. c. the area is too dangerous. d. the area has little water and arable land. 3. what was one effect of plate movement on the pacific region? (1 point) a. australia and new zealand became b. connected to north america. c. plate movement isolated many species. few volcanoes formed. d. the regional climate grew much colder. 4. you live on a small island in the pacific ocean. though beautiful, your island has poor soil for farming and few natural resources. you most likely live (1 point) a. on a densely populated island. b. on the south island of new zealand. c. in new guinea on a volcanic island off the coast of australia. d. on a low island. 5. which change would most likely have to take place first to encourage more human settlement in the outback? (1 point) a. the climate would need to get warmer. b. the winters would need to be milder. c. the region would need more fertile land and water d. people would need to build more cities there. 6. what would be an example of how the maori are reclaiming their culture? (1 point) a. learning english b. playing rugby and other sports c. studying maori culture in schools d. learning how to cook asian cuisine 7. what conclusion can correctly be made about british colonization of this area? (1 point) a. the british policies embraced the cultures of the original inhabitants. b. the british disregarded the cultures of the original inhabitants. c. the british had a neutral policy toward native cultures. d. none of the above plz answer these