Answer: the answer is False
Explanation:
 
        
             
        
        
        
The increased pressure forces the carbon chain structure of whatever element into a crystalline structure since that's the most resilient molecular structure. so is A
        
                    
             
        
        
        
Answer:
They remain in an environment,even as more competitive species arrive
Explanation:
Pioneer species, in ecological succession, are the first set of organisms to colonize a bare area of land or a disturbed area of land. Pioneer species include lichens, grasses, fungi etc. 
Pioneer species have unique characteristics that distinguishes them from every other species of organism. These include:
- They facilitate environmental change, making an environment more habitable for other species.
- They tolerate a wide range of environmental conditions. 
- They are capable of colonizing a barren environment, as in primary succession. 
However, pioneer species do not remain in an environment, even as more competitive species arrive. They rather give way for new species to emerge and dominate. 
 
        
             
        
        
        
The answer to the question stated above is letter b. <span> <span>a meteor or asteroid colliding with Earth
</span></span> <span>The mass extinction at the end of the Mesozoic Era was caused by </span>a meteor or asteroid colliding with Earth. This was said to happen about 65 million years ago.
        
                    
             
        
        
        
It is what makes plant stems, leaves, and branches so strong.