Here are the answers to each of your questions:
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Which type of connection shows how ideas are similar or different?
- Response: comparison and contrast
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Which two things are compared in this sentence?
- Response: real coral reefs and artificial reefs
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Which type of connection is made between the ideas in these sentences?
- Response: problem and solution
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Which type of connection does the author make between the ideas in this sentence?
- Response: contrast
If you have any more questions or need further clarification, feel free to ask!