B. Bone denesity because as we age our bones become brittle and can break easily hence why older people often break their wrist or hips when falling. And being fit can help.
        
                    
             
        
        
        
Answer:
Hi there, I doing pretty B today, how about yourself? Thank you for asking
Explanation:
 
        
             
        
        
        
Answer:
C) One passage provides objective economic data about the river while the other tells the story of two boys adventuring on its water.
Explanation:
The main idea of Mary O'Dell's passage is to present the Mississippi river as an important resource which was used for development of river transport, thus 
contributing to the nation's economic growth.
Twain's passage, although also mentioning Mississippi, does so only to give his story a setting, a place for adventures of the two wannabe pirates.
So, the basic contrast between two passages is best described in answer C.
 
        
                    
             
        
        
        
Answer:
A. In fact, elephants place such huge demands on their own environment, that in order to survive, they often come into conflict, with humans, who are competing for the same resources.
Explanation:
I think this is the answer. The sentence before states that elephants devour several hundred pounds of plant matter in a single day, so this is why i would say "in fact". I'm sorry if this is the wrong answer!
 
        
             
        
        
        
Answer:
1. F.
2. T.
3. T.
4. T.
5. T.
6. T. 
7. F.
8. T
9. T.
10. F.
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Brainliest will be appreciated thank you!