Because it is the most remembered part of a speech, you should spend sufficient time making the as effective as possible.

- Conclusion.

Explanation:

The conclusion is the most significant as well as a most remembered part of the speech as it primarily intends to restate the key ideas of the speech in a compact and concise form along with the inclusion of authorial remarks and suggestion that leaves the readers with a take away that they would remember.

Thus, it is always advised to give sufficient time to frame the conclusion of a speech in order to make it as effective as possible because it is the most captivating part of the speech that reiterates the ideas discussed in introduction to reinforce these ideas impactfully to the readers along with the author's comments that reflect that how his ideas are reliable enough to be believed.

Conclusion.

Explanation:

Conclusion can be defined as an ending reached after reasoning or judgment.

In a speech or any piece of writing or presentation, an introduction and conclusion are most important part because an introduction helps the audience to get to know the theme of your speech or presentation, whereas, a conclusion helps the audience to remember the main points of the speech.

To write an effective conclusion it is important not to just summarize the speech but to link all the main points with the examples and the reasoning made in the speech because the audience may not remember whole of the speech but if conclusion is made effective then they will be able to remember what the speaker wanted to convey.

So, the correct answer is the conclusion.

b) the planets year length would be longer

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classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.