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A Closed Environment
Analyzing Your Data
1. In your observations of tubes E through H which of the tubes,
if any, are yellow?
2. What is the reason bromthymol blue turns yellow in these tubes?
3. Are any of the tubes blue in color? What does blue indicate?
4. Are any of them clear? What does clear indicate?
5. Which of the tube groups ABCD or EFGH is most likely to remain
clear? Why?
6. What do you think is the relationship between photosynthesis and
respiration?
7. How is this activity relevant to humans in space? What implications
does this study have for space travel and for living in a closed environment?
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