300 BC by Greek philosophers
        
             
        
        
        
I believe the thyroid controls most, if not all of those things. (Again, I'm not entirely sure.)
        
                    
             
        
        
        
Eukaryotic cells are large complex cells with a nucleus
eukaryotic cells
        
             
        
        
        
The correct solution for this is explained the first option. Since water has an equivalent amount or number of H ions and OH ions, pure water itself is not slightly acidic nor basic. This equality of ions, causes the pH of water to be around the mid point of the pH scale which goes from 0 - 14, and thus is 7. This is a neutral pH.
        
                    
             
        
        
        
Answer:
A and D I think
Explanation:
It's not erosion, so that is out of the answer choices. And I doubt it is crystallization, so that is why I think it is A and D. (correct me if I am wrong.)