To determine how Paragraph 7 contributes to the development of ideas in the article, we would need to analyze the content of that specific paragraph. Since the text is not provided, the best answer would depend on the main themes and focus of the article.
If Paragraph 7 focuses on the history or etymology of "chlorophyll," then A would be correct. If it discusses the process of photosynthesis and sugar production, B would be the right choice. If it covers the unique ability of the sea slug to perform photosynthesis, C would be fitting. Finally, if it compares the mechanisms of photosynthesis in plants and animals, then D would be accurate.
Without the actual content of Paragraph 7, I can't select the correct answer. If you can provide that content or key details, I can help further.