Answer:
A  theory
Explanation:
A theory is an idea used to account for a situation or justify a course of action.
 
        
             
        
        
        
Answer:
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Hydrogen ions play a central role in the lives of cells. For example, changes in hydrogen ion concentration are intimately tied to the charge of side chains in proteins. This charge state, in turn, affects the activity of enzymes as well as their folding and even localization. Further, the famed ATP synthases that churn out the ATPs that power many cellular processes are driven by gradients in hydrogen ions across membranes.
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Explanation:
 
        
             
        
        
        
Answer:
....I started from where you ended....
friction
velocity
net force
speed
balanced force
mass
weight
centripetal force
newton
unbalanced force
rest
force
Explanation:
 
        
             
        
        
        
Death can be caused by breathing in lots of lead
        
             
        
        
        
Asexual reproduction produces offspring with identical DNA to the parent and sexual offspring has a combination of DNA from two parents.