Hydrophilic heads, hyrdophobic tails. Heads are made of phosphate and the tails are made of lipids.
        
                    
             
        
        
        
Answer:
gene pool? species? 
Explanation:
Question is a bit vague hope this helped tho :(
 
        
             
        
        
        
A. producers
producers=plants=autotrophs
Hope it helps! Comment if you have any questions and have an amazing day! 
 
        
                    
             
        
        
        
Answer:
oxygen because 
Explanation:
because u  can survive 3 days with out it  and if u did not have oxygen u would suffocate
 
        
                    
             
        
        
        
The extension of the forebrain that receives odor input from the nose is the olfactory bulb.
Good luck :)