Read the following excerpt from a student report written for a biology course. Which of the following should the student change in order to better suit the audience and purpose of the essay?

include more vivid sensory details
remove overly biased language
limit repetition of the word “eels”
clearer description of eel habitats

The student should change the repetition of the word "eels" in order to better suit the audience and purpose of the essay.

To determine which aspect of the student report should be changed to better suit the audience and purpose, let's consider the key components of the question. The student report is written for a biology course, indicating the intended audience is likely a scientific or academic audience. The purpose of the essay is not explicitly stated, but since it is for a biology course, it can be inferred that the purpose is to provide a scientifically accurate and informative analysis.

Now, let's evaluate the given options:

1. Include more vivid sensory details: Although vivid sensory details can enhance the readability and engagement of a piece of writing, they may not be necessary or appropriate for a scientific report. Hence, this option might not be the best choice for this particular audience and purpose.

2. Remove overly biased language: In scientific writing, it is crucial to present information objectively, without personal biases or opinions. Therefore, if the student report contains biased language, it should definitely be removed to better suit the audience and purpose.

3. Limit repetition of the word "eels": Repetition should generally be minimized in any type of writing to maintain clarity and avoid redundancy. If the student excessively uses the word "eels" in the report, it might be a good idea to limit the repetition to improve the overall quality of the essay.

4. Clearer description of eel habitats: Providing a clear and accurate description of eel habitats is an essential aspect of a biology report. If the student's current description lacks clarity or detail, it should be revised to better suit the audience and purpose.

Based on the analysis, it can be concluded that the student should change options 1 (include more vivid sensory details), 2 (remove overly biased language), and 3 (limit repetition of the word "eels") to better suit the audience and purpose of the essay. However, option 4 (clearer description of eel habitats) aligns with the audience and purpose, so it does not require a change.

Based on the excerpt, the student should change the following aspect of the report to better suit the audience and purpose of the essay:

- Remove overly biased language.

The student should ensure that the report is presented in an objective and unbiased manner, as scientific writing typically avoids personal opinions or biases. The inclusion of biased language may undermine the credibility of the report and make it less suitable for the intended audience and purpose.