Answer:
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. ... Gravity creates stars and planets by pulling together the material from which they are made. Gravity not only pulls on mass but also on light.
 
        
             
        
        
        
Same number of atoms on the outer shell, will have similar melting and boiling properties
        
             
        
        
        
break down lactose
β-galactosidase is necessary for organisms as it is a principal provider in the generation of energy and a source of carbons through the breaking of lactose to galactose and glucose.
 β-galactosides combine carbohydrates comprising galactose where the glycosidic linkage lies above the galactose particle. Substrates of various β-galactosidases incorporate, lactose, ganglioside GM1, lactosylceramides, and various glycoproteins.
 
        
                    
             
        
        
        
Answer:
Prokaryote/Bacteria.
Explanation:
The features of the cell which is mentioned in this question match with that of prokaryotic organisms like bacteria. 
The salient features of a bacteria are mentioned as under:
1) Presence of nucleoid instead of nucleus: Bacteria do not have well defined nucleus like eukaryotes so their chromosomal material is freely scattered in the cytosol.
2) Plasma membrane: They have plasma membrane which surrounds their interior i.e. their cytosol and other organelles.
4) Cell wall: Outside their plasma membrane they have a rigid cell wall made up of peptidoglycan which provides them a specific shape. 
3) Ribosomes: They have a lot of ribosomes in their cytosol.