A common pioneer organism<span> in a primary </span>succession<span> is the. icº, ) - 3. The final stable state of a </span>succession is called the<span> (Mººp community</span>
        
             
        
        
        
Explanation:
B
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Answer: 
The correct answer is option (D) there was a time in Pennsylvania history when dinosaur existed. 
Explanation: A paleontologist discovers a rock slab on which the footprints of a Pennsylvania dinosaur are well preserved. This means that there was a time in Pennsylvania history when dinosaur existed in this area. Here fossil is a fragment of rock on which the footprints of dinosaur is present. 
 
        
             
        
        
        
Answer:
xylem cell and phloem cell 
 
        
             
        
        
        
Answer:
Inter-Tidal Zone
Explanation:
This area is known as the inter-tidal zone, where the animals must be able to withstand the sun's heat and the ocean.