Explanation:
Homologous chromosomes are 2 physically different chromosomes that have the same genes but are not genetically identical. Sister chromatids are 2 copies of a single chromosome and so are genetically identical (they also are physically attached to one another).
 
        
                    
             
        
        
        
The physical distance that separates them on the chromosome.
        
             
        
        
        
Answer:
D.
Explanation:
Hope this helped! Good luck!
 
        
             
        
        
        
Carbon dioxide is not safe for your lungs because once it reaches your lungs it will stop your breathing and you could die.
        
                    
             
        
        
        
Answer: Definition of Selectively Permeable Membranes. All cells are enclosed with a cell membrane. A selectively permeable cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.