100 points please help i'll mark brainliest How did Cheyenne's ability to adapt to and modify its environment contribute to its growth and development? Please provide details and examples in your response.

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

35 points pls fast. in a citizens elect the president as head of government separately from the legislature. question 1 options: parliamentary democracy communist state presidential democracy autocratic state question 2 (1 point) this form of government has only a single political party. question 2 options: communist democratic autocratic parliamentary question 3 (1 point) this is a government controlled by one person with absolute power. question 3 options: communist democratic autocratic parliamentary question 4 (1 point) a government is a government system where all citizens that choose to vote have a say in their government. question 4 options: communist democratic autocratic theocracy question 5 (1 point) in a the people elect the legislature, and the legislature chooses the head of government. question 5 options: parliamentary democracy communist state presidential democracy autocratic state

Brainliest to who answers! what is the function of a purchasing cooperative, or co-op?