When testing a hypothesis, scientists use repeated trials and replication to make sure that they get the same answer each time, and that it isn't just a lucky guess the first time. They need be sure that the answer to their hypothesis is 100% the same every time.
Hmmm let me think.........
Answer:equal to rotation period
explanaition i took the quiz and got this one right
Answer:
instrument that is used to view magnified images of small objects on a glass slide
Explanation:
Zacharias Janssen
