Answer: As water is cooled, its density increases until it reaches about 4˚ Celsius. 
hope this helps you :D
i apologize if i got it wrong 
 
        
                    
             
        
        
        
Answer:
Kidneys : helps in forming urine 
Ureter : They are connected to kidney and by peristaltic action transports urine from kidneys to bladder .
Urinary bladder : It is an hollow sac that holds the urine .
Urethra : transports urine from the bladder to outside of the body .
Explanation:
The human excretory system consists of   : Kidney ,ureter ,urinary bladder and urethra .The figure is shown below .
Now , as far as functions are concerned we have :
Kidneys : They have excretory units called nephrons that  further  consist of :
- Bowman's capsule
- PCT (Proximal convoluted tubule )
- DCT (Distal convoluted tubule)
- CT (collecting tubule )
In nephrons urine is formed and via ureter it is transported to a hollow sac like structure called  urinary bladder .
This bladder has muscles that cant remain contracted up to longer period )and then voluntary and involuntary it is excreted through urethra .
The process of passing urine is called Micturition .
 
        
                    
             
        
        
        
Answer:
NK cells<em><u> perform all of these roles</u></em>
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hope this helps
-lvr
 
        
             
        
        
        
Answer:
A purebred organism can either be TT or tt.
It is possible for two genetically different plants to have the same phenotype.
Explanation:
 
        
             
        
        
        
That fact can be explained by the similarity in their genes. 
Dogs and coyotes are from the same class, family and genus (Mammalia, Canidae, Canis). 
This is almost enough for their offspring to be viable. But if the DNA is similar (which it is) offspring the chances of viable and fertile offspring is high almost at 100%.
Hope it helped,
Happy homework/ study/ exam!