Answer:
Substance B is a group of hydroxide ions.
Explanation:
 
        
             
        
        
        
Answer:
Through natural selection the disease gain immunity to the antibiotic.
Explanation:
As the antibiotic  kills off the members of the population that are not resistant, leaving only the resistant members. These members then reproduce, passing the immunity to their offspring, causing the population to become immune.
 
        
             
        
        
        
Answer:
the umbilical cord is considered both the physical and emotional attachment between mother and fetus.
Explanation:
this structure allows for the transfer of oxygen and nutrients from the maternal circulation into fetal circulation while simultaneously removing waste products from fetal circulation to be eliminated maternally.
 
        
             
        
        
        
Milgram found that subjects were more likely to obey in some circumstances than others. Obedience was highest when: Commands were given by an authority figure rather than another volunteer. The experiments were done at a prestigious institution.
 
        
             
        
        
        
Answer: the tree is taller and place you carved your name is wider
Explanation: trees increases at their branch tip and so the carving on the base of the tree will still remain at the same spot you Left it. As the tree grows consistently, the base also expand the trunk because the trunk of the tree grows outwardly therefore the carving will expand since the truck of the tree increases in diameter.