<span>"Autotrophs are the producers in a food chain, such as plants on land or algae in water" </span>
        
                    
             
        
        
        
Sidney W. Fox produced proteinoid spheres, which suggest a possible route from chemical to cellular life.
 
        
                    
             
        
        
        
Answer:
5.6L
Explanation:
Given parameters: 
number of moles  = 0.25mol
pressure on gas  = 1atm
temperature  = 273K
Gas constant R = 0.0821Latm/molK 
Unknown: 
Volume of gas  = ? 
Solution: 
Using the ideal gas equation, we can solve this problem. The equation is a combination of the three gas laws: Boyle's law, Charles's law and Avogadro's law. 
It is mathematically expressed as; 
              PV = nRT
where P is the pressure
            V is the volume 
           R is the gas constant 
           T is the temperature
           n is the number of moles 
All the parameters are in the appropriate units and we simply solve for the volume of the gas; 
 
                 1 x V = 0.25 x 0.0821 x 273
                       V  = 5.6L
 
        
             
        
        
        
Answer:
round worms reproduce sexually 
the nervous system of a roundworm contains a brain and nerve cords