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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Answer key
We do not have a key for this activity, but I believe that the information in "Cellular Respiration and Photosynthesis – Important Concepts, Common Misconceptions and Learning Activities (/exchange/bioactivities/cellrespiration) should make it relatively easy to prepare a key. In addition, you may want to consult a good introductory textbook, since the information needed is generally covered in introductory biology textbooks. If you have any additional specific questions, please let me know and I will be happy to answer your questions.