Maaf tak boleh tolong. >:D Just kidding.
The essence of this essay are facts, therefore a mind map (google it) is preferable as opposed to a flow chart. Write down what you know about a scientist's occupation. These may include:
-what is a scientist
-what do they do
-which field of studies are they involved in (obviously science, try to be more specific)
-how do they help people
-how do people view scientists
Then write down an introduction. Use metaphors (the moon is a majestic ship sailing across the sea of clouds) and similes (the moon is like a tempting brick of cheese, so tasty yet out of reach) and try to avoid using idioms and complicated vocabularies (as you may end up misusing them). Idioms also becomes stale once it is abused. The introduction must introduce your readers to the topic. Therefore, it is best for you to tell your readers what a scientist is and people's view towards them.
Then you can begin writing the contents of your essay. Make at least 3 paragraphs for your contents. The 3 paragraphs may be:
-what they do
-their field of studies
-how they help people
You can easily expand on these 3 topics and impress your teacher with your writing skills. If you can't think of anything, then ask people around you and consult Mr. Google if all else fails.
Finally you can write down a conclusion. The conclusion should restate what you have written in your introduction. If you happen to use the introduction I suggested, the conclusion should say the same thing which are what a scientist is and people's view towards them. You must also include your wish (not the kind you say when blow cake candles) so that the reader may know why you wrote the whole thing in the first place.
Hope this helps :D Cheers.