Answer:
Su aportación fundamental fue su modelo del universo: creía que la Tierra estaba inmóvil y ocupaba el centro del universo, y que el Sol, la Luna, los planetas y las estrellas giraban a su alrededor. La retrogradación de los planetas y su aumento de brillo mientras retrogradan.
Explanation:
 
        
                    
             
        
        
        
Answer:
they may "loop out" of the cell cycle and into a resting state called G0, from which they may subsequently re-enter G1 under the appropriate conditions
Explanation:
 At the G1 checkpoint, cells decide whether or not to proceed with division based on factors such as: Cell size
 
        
             
        
        
        
Because cells are in ever living thing
        
             
        
        
        
Answer:
heat transfer in a fluid in which hot fluid rises and cold fluid sinks; setting up a cycle