It could be said that the astronomer who placed the sun in the center of the solar system was Copernicus. 
He developed the model of the universe that placed the Sun in the center rather than the Earth. It was considered the Copernican Revolution because of its contribution to science and the change of paradigm. 
        
             
        
        
        
Answer:
The best description of the events occurring during Ana-phase I of meiosis:
c. Homologous chromosomes randomly separate and migrate to opposite poles.
Explanation:
Meiosis:
It is such type of cell division that occur in animals, plants resulting in four daughter cells and each of daughter cell have the half number of chromosomes from the parent cell. 
- Anaphase is one of important phases of meiosis. The option a is incorrect as chromosomes go randomly to opposite poles.
- The option b is incorrect as all of chromosomes inherited from mother and father goes randomly to opposite poles.
- The option c is correct as it is the true description of anaphase I of meiosis.
- The option d is incorrect as the sister chromatids don't separate rather they remain joined.
 
        
             
        
        
        
Answer:
the soil matter formed by decade organic matter is called humus.
 
        
                    
             
        
        
        
B.Prokaryotic cells do not have a true nucleus or membrane-bound organelles.
        
                    
             
        
        
        
This process is referred to as Ammonification, I believe, basically this allows Nitrogen to be in the appropriate form for plants to absorb it.