its obviously not child labor or economy based because those have nothing to do with the environment so its the other three.
 
        
                    
             
        
        
        
both are smart and can use there hands for grabing things and some can use sign language to humans 
 
        
             
        
        
        
Answer: B) Compounds contain two or more elements
Explanation: 
 
        
             
        
        
        
<span>reformists muscle originates from the anterior front part of the sacrum, the part of the spine in the gluten region, and from the superior margin of the greater sciatic notch as well as the sacroiliac joint capsule and the tuberous ligament. Hope this helps :)))))))))</span>
        
             
        
        
        
1.) Achodroplasia is a autosomal dominant disorder, the suspected case suggested that inorder for the parents to produce and offspring with achondroplasia. One parents must have a single mutant gene of achodroplasia to be inherited by his offspring. for this case, It is suggested that the offspring might have developed its own mutant gene as it only affect 1 in 25,000 birth. There is changes of genes during early development. 
2.) The mother said that they don't have that history of disorder. again, it's autosomal dominant disorder. one parents must have that kind of disorder so their child can also inherit it. Thus, no of the childs parents is a carrier.