Explanation:
radius is 8 because radius is half of a diameter 
 
        
             
        
        
        
15 points is the answer 
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As the world evolves, there is a change in the ecosystem, and with that comes the fluctuation. Organisms have have changing populations as they adapt, slowly die out, or thrive in the new ecosystem.
        
             
        
        
        
The advantage that is conferred to algae and plants that have sporopollenin is that they have reproductive cells that are more resistant to desiccation. Remember that a sporopollenin is a polymer that is inert and makes up the outer layer of pollen grains and spores. Sporopollenin<span> is also found in the cell walls of several taxa of green </span>alga<span>, including Phycopeltis </span>