The mass would be 0.5kg
To find the mass of an object with acceleration and force would be 
m = f/a
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I hope this helps! (i just googled it)
A bactericidal antibiotic, such as penicillin, kills the bacteria. These drugs usually interfere with either the formation of the bacterial cell wall or its cell contents. A bacteriostatic stops bacteria from multiplying.
        
             
        
        
        
Well advance in technology is always good. The advancement helps so that information can be gathered quickly.Also it helps to understand things better. like before telescopes or microscopes scientist could only eyeball things but later the advancement made it easy to see things human eyes cant see.
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Answer:
all 37 trillion cell in the body originates from a single fertilized egg called a zygote. The zygote divides repeatedly to produce an embryo. These embryonic cells continue to divide, differentiating into all the cell types present in the body of all humans (and other mammals), from a new-born baby to an elderly adult.