When can you not play outside even if you have a big playground and many players​

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

The zealots and sages, like ben zaccai, opposed the romans in different ways. describe the differences.

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?