Nitrogen fixation, N2 --> NH3+, is not something that plants to by themselves but some plants have bacteria that does this. I believe that pea plants have these, but I'm not 100% sure. 
        
             
        
        
        
From the brightness of the light of course. If the brightness is increasing it means the the light source is approaching and if the brightness is decreasing it means the light source is leaving.
        
                    
             
        
        
        
Answer:
1) red blood cells
2)erythrocytes
3)keep them warm and seek help
Explanation:
I don't know if this will help you I was in first aid so the last one may or may not help you
 
        
                    
             
        
        
        
Answer:
The  correct answer is negative feedback.
Explanation:
Negative feedback is considered the mechanism that frequently regulates biological reactions in the body. Negative feedback helps reduce the stimulation of some processes, such as controlling the temperature.
It can be seen that negative feedback works by redirecting some processes that go to one point directs a degree of that process to a different location.
In this case, on the temperature, the feedback is responsible for putting the system to work from the moment it starts to sweat using the different processes to regulate the temperature. This process uses help from enzymes and body pathways.
<em>I hope this information can help you. </em>