Answer:
A. An ecosystem
Explanation:
All the organisms on your campus make up the <em>ecosystem</em><em> </em>
Answer:
C3 photosynthesis produces a three-carbon compound via the Calvin cycle while C4 photosynthesis makes an intermediate four-carbon compound that splits into a three-carbon compound for the Calvin cycle. Plants that use CAM photosynthesis gather sunlight during the day and fix carbon dioxide molecules at night.
Explanation:
Answer:
C. Can't be observed directly