First Plasmid is a chromosomal element often a circular DNA.
The uptake of a plasmid from the environment is NOT a common event reason being, bacteria naturally take up DNA from their environment in a process called transformation. Thus if a bacterium takes up a piece of DNA that cannot be maintained in a cell then that cell will not survive.
Answer:
NaF: one atom of sodium, one atom of fluorine
Na2CO3: two atoms of sodium, one atom of carbon, three atoms of oxygen
NH3: the diagram shown
C6H12O6: six gray spheres, twelve white spheres, six red spheres
Lower atmosphere and surface is your answer!!
