Karla lists the steps of her scientific analysis in the form of a flow chart. Which step should Karla go back to as a result of her conclusions?

3. Suggests grazing by marine animals is the cause of the difference in height.

Explanation: Because Karla concluded that another factor caused the difference in height, she must go back to where she first suggested the original cause in height difference. In the first step, Karla observes the height difference, in the second step she forms a question, but in the third step Karla forms a hypothesis. Karla now needs a new hypothesis to why there's a height difference, so this is the step she must change