The number of electrons in the outermost shell of an atom determines its reactivity. 
 
        
             
        
        
        
Answer:
<u><em>Ozone.</em></u>
Ozone occurs both in the Earth's upper atmosphere and at ground level. Ozone can be good or bad, depending on where it is found. Called stratospheric ozone, good ozone occurs naturally in the upper atmosphere, where it forms a protective layer that shields us from the sun's harmful ultraviolet rays.
Explanation:
I searched and found my answer on Go ogle.
 
        
             
        
        
        
gene pairs - AABBCCDdEeFfGgHhIiJj
number of possible types of eggs - 1*2*2*2*2*2*2*2=128
reply "a" is good 
 
        
             
        
        
        
Heliocentric theory thank you for your time .
        
             
        
        
        
Answer:
The physical visible appearance an allele gives an organism
Explanation: