D) Rifting adds new rock to a continent and cause the continent to become wider.
Hope that helped, Good luck! (:
Answer: Over 15,000 people
Explanation: Between the times of 1793-1812 over 15,000 US Sailors were impressed.
If he wants the study to meet scientific standards then the study needs to adhere to the scientific method. The scientific method is made up of several steps.
Step 1: Define the question he wants to ask. So in this it would be something along the lines of, how do people interact with one another.
Step 2: Then do background research into the subject matter.
Step 3: Construct/devise a hypothesis. What does he expect the outcome of the study to be.
Step 4: Test his hypothesis by carrying out the experiment. Make it clear what kind of experiment he intends on using for example an observation.
Step 5: Analyze the data gathered from the experiment.
Step 6. Draw a conclusion from the results.
Step 7: Share the results through writing a report/article.
B and c is the answer to your question
