Answer:
-lack of food in the area
-more predators
-envirment changes
-over population 
Explanation:
 
        
             
        
        
        
Answer:
Red blood cells transport oxygen around the body. They are specialised to carry oxygen because they: contain large quantities of a protein called haemoglobin , which can bind oxygen. don't have a nucleus, so there is more room for haemoglobin.
Explanation:
 
        
             
        
        
        
It is the repiratory and the circulatory
        
                    
             
        
        
        
That would be the Thymus Gland.
        
                    
             
        
        
        
A lunar eclipse happens when the Moon passes directly behind the Earth and into its shadow. This can only happen when the Sun, Earth, and Moon are aligned. Because of this, a lunar eclipse can only happen on the night of a full moon. 
The moon gives off a reddish appearance during this time because the only light reaching the moon and reflected off of its surface is the light refracted by the Earth's atmosphere (the same reason a sunrise/sunset appears reddish). 
A totally eclipsed full moon is also known as a Blood Moon because of it's colour
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