To write an essay about a historical event, I would do research. I would consult textbooks, the internet, and other resources that have information relevant to a historical event that I am writing an essay on. To write an informative essay about a historical event, I would want a strong thesis statement, and strong supporting body paragraphs. I would want the body of my essay to be full of detail and factual information from my research (which of course you want to sight :)) Additionally, I would want to use strong transition words and powerful vocabulary. Finally, I would want my essay to be engaging.
Hope this helps :)
Either the 2nd or 3rd bullit point
Answer: No, his experiment is not designed correctly.
Explanation: He didn't use the same measurements in each experiment. He should've either buried them all in the yard, or she should've kept them all in pots. Not having them in the same environment could affect the results of his experiment, thus making it inaccurate.