Final answer:
Mr. Johnson should survey his students to find the type of sea animal his students should study because they will be the ones doing the studying and may have personal interests or preferences.
Step-by-step explanation:
In order to find the type of sea animal his students should study, Mr. Johnson should survey his students. Since they are the ones who will be doing the studying, it is important to involve them in the decision-making process. They may have personal interests or preferences that can guide the choice of sea animal.
Surveying teachers at his school or parents of his students may provide some insights, but it would not be as effective as involving the students themselves. The teachers and parents may have their own interests or opinions that are not necessarily aligned with the students' learning needs and interests.
Surveying workers at a sea animal park may be informative as they have specialized knowledge about sea animals. However, their expertise may be focused on specific animals or areas of study, so it may not necessarily reflect the best choice for the students.