Answer:
a. manipulated independent variable
Explanation:
The critical versus neutral comments to the students are the manipulated independent variable. The manipulated independent variable is the variable the researcher has influence on, he can change and manipulate in a study, the researcher can decide to increase or reduce the variable. the dependent variable is affected by it.
They own the means of production by displacement
Answer:
The sickle made it easier to use slash-and-burn farming. The sickle made it easier for farm animals to harvest crops. The sickle made it easier to plant the seeds for new crops.
Explanation:
