Discuss in 1-2 sentences why, from a scientific perspective, the heliocentric model of the universe took so long to become the accepted model of the solar system. in other words, assuming society would have let them, why couldn't someone prove that the heliocentric model was correct sooner?

In the modern world, many countries with kings or queens have evolved into constitutional democracies. in these countries, monarchs are mostly

Why are the majority of the world's economies mixed? what may happen to the "pure" types of economies (traditional, socialist/command, market capitalist) when they incorporate elements from other economic models?

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: