A thorough soil analysis
Explanation:
A through soil analysis must be included in Jordan's report in order to ascertain is findings. 
Since he seeks to determine the effect of various soil pH on plant growth, it is pertinent he performs a pH analysis of the soil. 
- The soils pH is the independent variable. It is the cause of the varying plant growth according to the hypothesis he must have formulated,. 
- The dependent variable is the pant growth. 
- It will be incomplete to exclude the soil analysis report from his findings. 
The soil is the component that contains the minerals that conditions pH. 
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Photosynthesis is used by plants for energy. In addition to carbon dioxide and water, light and chlorophyll are required for photosynthesis to work. 
        
             
        
        
        
Answer:
In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory
Explanation:
 
        
             
        
        
        
Answer:
The lowest layer of the sun's atmosphere is the photosphere
Explanation:
The atmosphere of the sun is composed of several layers, mainly the photosphere, the chromosphere and the corona. It's in these outer layers that the sun's energy, which has bubbled up from the sun's interior layers, is detected as sunlight.