Can somebody me with this last question ?

What is a codon and where is it found

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels