Have to use transitional words for your work to flow. In the beginning middle end. you don't want to seem as if it all goes together, you don't need evidence or commentary that doesn't make since. transition words are very needed to help your paper make since and flow all together.
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It's important since learning about the opposite-sex reproductive system helps you understand what the opposite sex has to go through and have more of an understanding of how your body and how other peoples bodies work. It might help you in the future when you are trying to have a baby or help you take care of your body better.
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