The way the underlined words affect the meaning of the passage is:
- C. They encourage readers to learn more about dolphin life cycles
Highlighting
This is the calling of attention to something so that a reader would not miss the information and this can be done either by bolding, underlining, etc.
With this in mind, we can see that from the given text, the underlined word is used to highlight the fact that the readers should learn more about the life cycles of dolphins.
Read more about highlighting here:
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