The answer is A. B is wrong because it is changable
Answer:
A- they traded valuble resources for protection
Explanation:
it is correct
Answer:
A
Explanation:
A) land was inexpensive in the west.
Answer:
The answer is: No.
Explanation:
According to the example given the answer would be: No. Because the researcher does not influence the responses in any way. This person is just watching a report. This is called an observational study. An experiment would be needed to confirm the effectiveness that ibuprofen can have.
