It takes 8 electrons to fill a shell.
        
                    
             
        
        
        
Answer:
<h2>2. Peter's maternal grandfather has PKU.</h2>
Explanation:
- Such type of the genetic disorder in which two copies of a gene must be mutated at a time is called autosomal recessive disorder such as sickle cell anemia, phenylketonuria, and some other diseases.
-  When a sing copy of a gene is mutated in a person then this disorder is not appeared and the person is called a carrier.
-   So when a child is born by two carrier parents then there is a chance that a child will be affected if both the parents donate mutated genes.
-  In the case of Peter, since peter does not show this defect this means his maternal grandfather was affected by this disorder.
 
        
             
        
        
        
Answer:
D. They rented farmland from white landowners.
Explanation:
 
        
                    
             
        
        
        
Answer:
Herbivores, Carnivores, Omnivores
plz mark me as brainliest.