In Mattie's mind, Blanchard's balloon—“a yellow silk bubble escaping the earth”—symbolizes freedom, particularly an escape from her home, where she feels as if she's trapped and treated like a child.
 
        
                    
             
        
        
        
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So for years, scientists have been trying to use cloning techniques to make embryonic stem cells that are essentially a genetic match for patients. The idea is that such a close match would prevent their bodies from rejecting the cells. "It's been a holy grail that we've been after for years,"
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Answer: B. optimum athletic performance is dependent upon a clean environment
Explanation: It is known that an optmun athletic perfomances requires certain conditions in order to be carried out. One of those condition is the cleanliness and the well-being of the environment, because it is part of the setting and the context of the enclosure in where the perfomance takes place. Being this perfomance dependent upon a clean environment, team sports will be contributing to overall environmental health. 
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"That man over there... aind ain't I a woman" - Rhetorical Question
This is beacause of the question posed by the speaker "ain't I a woman." This is more of a statement of fact than an interrogative statement. As such the speaker isn't looking for an answer, but is instead making a point.
"For who is there... torn from his limbs" - Rhetorical Question for the same reason as above.