How were Sun Yixian's ideas different from Yuan Shikai's ideas?

Which of the following early north american cultures were known for building wigwams and longhouses? a. eastern cultures b. great plains cultures c. western cultures d. northern cultures

Choose one of these concerns and write a short paragraph about its impact on africa. what has caused this problem to occur, and how has it impacted people who live there?

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.