You have been asked to write an essay about the chemical process of fire. Which of these is the most effective topic sentence for a paragraph in this essay?
There are three reasons why fire is important to the development of mankind: warmth, protection, and cooking.
One of the three elements that are required for fire to burn is oxygen.
O Campfires left unattended can have significant consequences, such as forest fires.
O Flames are the part of a fire that can be seen, and depending on the material being bumed, they can be different colors.

Read the excerpt from the dark game: true spy stories from invisible ink to cia moles. yet, by the time robert e. lee surrendered to ulysses grant at appomattox, virginia, some four years later, about 620,000 soldiers had died on the battlefields, more than american battle deaths in all other wars from the revolution through the vietnam war. what is the author’s primary purpose for including this detail? to inform readers about the differences between three military conflicts to persuade readers of the seriousness of the american civil war to entertain readers with tales from behind the lines of battle to encourage readers to visit battlegrounds in appomattox, virginia