<u>Answer:</u>  
Considering the nitrogen cycle, all organisms depend on bacteria to produce and maintain adequate nitrogen in the environment by eating the plants that contain bacteria which contain nitrogen.
Option: (B)
<u>Explanation:</u>
- Nitrogen is a main element in the nucleic acid of both RNA and DNA which is most important for all living creatures and biological molecules. 
- When plants doesn’t get enough nitrogen it doesn’t produce amino acid, without amino acid plant cannot make special proteins. 
- Amino acid is building block for DNA which tends to the generation of organism. 
- Nitrogen fixation is a process where bacteria convert atmospheric nitrogen to usage form for plant and animals get nitrogen by eating those plants.  
 
        
             
        
        
        
Answer:
 I think its true i dont really know. hope this helps!!
 
 
        
             
        
        
        
The answer is C because most blood types work with O type blood
        
             
        
        
        
Answer: without photosynthesis, there would not be any glucose or oxygen and those are what start off the respiration reaction. without respiration plants would use up all CO2 and starve to death. photosynthesis requires the products from respiration and vise-versa.