Answer: because they were probably old and needed replaced with some new ones
        
             
        
        
        
Answer:
2996
Explanation:
in the attack 2996 people including the 19 hijackers died on september 11, 2001.
 
        
                    
             
        
        
        
Answer:
humerus, radius, ulna, carpals, metacarpals and phalanges
Explanation:
but thats more than 3 so idk??
 
        
                    
             
        
        
        
Answer:
Use different types of sentences. 
Use several types of sentences instead of just one or two
Use different punctuation to emphasize mood.
Get a grammar manual. It is useful to have a thorough reference book nearby that you can consult when writing
Explanation:
Hope this helps!
 
        
                    
             
        
        
        
Answer:
The central idea of the passage 'Biomass Basics' is that biomass can be used to create biomass energy and fuel.
Explanation:
'Biomass Basics' is an article provided by the US Energy Information Association. The article talks about the biomass and how to use it to create enery and fuel.
The biomass can be defined as an organic material derived from animals or plants. It is a renewable source of energy.
<u>It can create chemical energy by burning it, and this energy can also be used for making electricity and providing heat to homes and factories. It can be used to create other forms of energy also like methane gas, ethanol, biodiesel, etc. It can also be used to create biomass fuels which reduce the waste and emission of green house gases.</u> 
Thus the central idea is that biomass can be used to create biomass energy and fuel.