A tolerance range is an environment where something can survive in. But if their is to much of one factor or to little this can effect the tolerance range.
 
        
             
        
        
        
Answer:
The correct option is : c. gas gangrene       
Explanation:
Gas gangrene is a serious bacterial infection caused by the infection of the Clostridium perfringens bacteria. This bacteria is always present in the nature and is a rod-shaped, gram-positive bacteria, that belongs to the Clostridium genus.  
This disease can cause gas production in gangrene, death of the muscle tissues and also sepsis. 
<u>Therefore, Gas gangrene is most associated with the bacteria Clostridium perfringens.</u>
 
        
             
        
        
        
Answer: B
Explanation:
If he saved the seeds and waited till summer the rays of light would make the flower red.
 
        
             
        
        
        
To easy remember it,
Phloem, has the (f) sound, so it carries food and nutrition like sugars all around the plant, up and down movwment.
while Xylem carries water and minerals, from down the soil up to the plant, only up movement.