Answer:
While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from a low of 2.1 million to 7 million people to a high of 18 million.
Explanation:
 
        
             
        
        
        
Disposal of human waste
through birds dropping the seeds of excreting them
through the dropping of seeds from the plants which sometimes are carried by the wind
        
             
        
        
        
<h2>Answer:</h2>
No, this not the accurate statement.
<h2>Explanation:</h2>
As in article in the local paper, a new copper line is found in New Mexico. And all that is needed to identify a substance is the mass and the volume of the substance. But this is not the truth because to identify a substance we need to know about is an atomic number, atomic mass etc so that we can define it in periodic tables.
 
        
        
        
Answer:
The heliocentric theory suggest that the sun is the central body of the solar system and perhaps of the universe. Everything else (planets and their satellites, asteroids, comets, etc.) revolves around it. The first evidence of the theory is found in the writings of ancient Greek philosopher-scientists.
Explanation:
hope it helps!
 
        
                    
             
        
        
        
They can all travel through empty space