To keep your essay at a manageable word count. Remember to avoid using filler words, overused phrases, and most of all, use only 1 topic per paragraph unless otherwise indicated. One topic that connects to the next topic will be better for your word count than 2 under developed topic explanations in every paragraph. That is the most common reason students write too many words in the essay.  
  
Good work on the prompt rephrasing. It kept the original topic and discussion reasons in your restated form. However, you should have avoided restating your opinion at the start. Since the comparison discussion had yet to take place, you should not have had an opinion to present just yet. However, some students prefer to include a personal opinion at the start so, provided you can connect your opinion to the public points of view, then you can go ahead and do that. Unfortunately, you failed to create a central discussion topic for your presentation so having a point of view immediately did not really work well for your essay.  
  
Your discussion paragraphs do not have connected topics. If you opt to discuss the medical aspect of the experiments, then you should stick with that topic as the central discussion focus for the next 2 paragraphs. Clarity comes from knowing how to discuss the same topic from two different points of view. Coherence, comes from your ability to clearly explain the positive and negative aspects of the same subject. Again, there are no right or wrong answers, just the opinions that you present that the examiner requires a clear explanation of. Once you keep your essay discussion paragraphs focused on a singular topic, you will find that you can express your full explanation without writing too many words. 5 sentences are normally sufficient if you simply state the facts as required:  
  
Sentence 1: Topic sentence  
Sentence 2: Reasoning sentence  
Sentence 3: Example sentence  
Sentence 4: Supporting explanation for the example sentence  
Sentence 5: Transition sentence  
  
Those are all the sentences you need to write. Stick to simple explanations. Do not be too wordy. Be direct to the point. That sentence number will bring you to within the 275-290 word count. Depending upon how long your sentences are. Just make sure to use simple and complex sentences to meet the GRA requirements.  
  
**Note:** Let me remind you that it is acceptable for students to ask for their essays to be scored here. You misunderstood, they are not asking fellow students to score their essays, they know you cannot appropriately score their essays since you are also learners, just like they are. They are asking me, the contributor, the trained professional to score their essays because they want to know what their weak points are, and how to improve upon it. My scores will never be wrong. It will be the closest to the actual scoring the examiner will give the student. It is accurate and helpful. I am sorry you cannot see that. These students want to pass the test and they are not afraid to find out where their weaknesses are, which it seems you are afraid to face. My scores help them focus their studies because they can pull up their scores where it matters and focus less on their strengths since everything becomes stronger when they improve overall. You learn differently from the others. Do not dissuade anybody from asking for professional help from a trained contributor here. Students really should not be scoring essays anyway, we have a suspension policy regarding that. Student scoring = Suspension. It's right there in the text box.