Final answer:
The best type of text structure to use when writing an essay to motivate people to save the polar bears is persuasive.
Step-by-step explanation:
If you want to motivate people to save the polar bears, the best type of text structure to use would be persuasive. A persuasive essay is designed to convince the reader to take a specific action or adopt a certain viewpoint through the use of compelling arguments and evidence. In this case, the essay would present facts and emotional appeals about the importance of saving the polar bears and the consequences of their extinction. It may also provide practical steps that individuals can take to contribute to their conservation efforts.
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