Answer:
3 would have purple petals, 1 would have white
Explanation:
 
        
                    
             
        
        
        
Hi the answer is called the Occipital Bone that connects the skull above the nape.
Hope this helps.
        
             
        
        
        
After the 1st half-life 250 g of the radioactive material will be left. 
<span>After the 2nd half-life 125 g of the radioactive material will be left. </span>
<span>After the 3rd half-life 62.5 g of the radioactive material will be left. </span>
<span>Therefore after 60 minutes, 3 half lives would have occurred. </span>
<span>Therefore the half-life = 60 / 3 = 20 minutes when 250 grams of the original material would have remained radioactive. </span>
<span>Therefore the answer is A) About 250 gram of the material decayed in 20 minutes.</span>