Answer:I'm almost sure it's b or d hope this helped
Explanation:
 
        
             
        
        
        
B would be the closest thing to wht you are looking for.
the observable universe is estimated to contain 200 billion to two trillion galaxies. 
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Answer:
To regenerate damaged tissue
Explanation:
Stem cells can be pluripotent, totipotent or multipotent depending on where they are sourced. This means that they are capable of differentiating into a wide variety of cells. Stem cells can, therefore, be harvested and induced to differentiate into cells or tissues that are intended to be repaired. 
 
        
             
        
        
        
DNA can illustrate that evolution has occurred since in the process of natural selection advantegeous genes or traits have been selected to pass on through generations and further more evolve as long as the species survies and is successful in reproducing.
 
        
             
        
        
        
Answer:
The answer is B- no muscle tension could be generated
Explanation:
During contraction cross  bridges are formed by the myosin thick filaments grabbing on to the actin thin filaments. . The overlap of the thick and thin filaments allows myosin to bind to actin. As more bridges are formed, more myosin will pull on actin and more tension will be produced.  Muscle tension is a condition in which the body remains semi-contracted for a longer time, it is caused when muscles contracts and do not release.
However, if the muscles are stretched to a point where the thick and thin filaments no longer overlap there will be no muscle tension generated.