D: All the variables are controlled except one.
it is grasshopper because they donot have backbones
Answer:
The correct option is C: Replication
Explanation:
Replication of scientific research is important so that scientists can check their work. If the research work carried out by one scientist is reproduced by another scientist to obtain similar results, this assures that the work is correct and the findings are valid.
Hope that answers the question, have a great day!
