Keeps oxygen intact within a circuit for the body
Provides protection from the effects of space's atmosphere pressure 
Weighs down the body to keep one on the floor of the planet/area they're on
        
                    
             
        
        
        
To my understanding they all do
        
                    
             
        
        
        
Answer:A improve farming techniques to reduce greenhouse gases.
Explanation:
 
        
             
        
        
        
Answer:
Normal Eyes = 75%
Heart eyes = 25%
Explanation:
3 of the offspring in that punnet square have at least 1 dominant allele. And if an offspring has at least 1 dominant allele then it should have the dominant trait( which is normal eyes ). But if it only contains recessive alleles then it would have the recessive trait (which in this case would be heart eyes).