Answer:
<em><u>B</u></em>
Explanation:
cell is the first organization level 
tissue is the second level
organ is the third level
organ systam is the fourth level
organsim is the last organization level
 
        
             
        
        
        
Its stored in the chloroplasts
        
                    
             
        
        
        
Your question isn't the most clear, but I think your answer is rocks, or more specifically phosphorous rich rocks because the phosphorous will mix with the sediments on the river's/lake's ground forming phosphorous rich rocks.
That means that It'll become a phosphate mineral and later become phosphorous again when the minerals weather.
Hope it helped,
BioTeacher101
 
        
             
        
        
        
I believe that it is the old growth not sure which one but between B and D I would go with B but I am not sure (hope I helped in some way )
        
             
        
        
        
Among the following the benefit of using agroforestry in a tropical rain-forest climate is that growing trees provides a boost in crop output for a short time.
Answer: Option A
<u>Explanation:</u>
Agroforestry is a kind of practice in which trees are grown along with the crop which benefits the crop; there is different alley cropping, silvopasture and forest cropping. 
Combining forests and agriculture seem to perform many benefits to the farmer. This type of practice has enabled farmers to show nutrient cycling, crop productivity and change in the micro climate of the place.