No they cant be mechanical because then something would have to generate their rays through the inventing of a machine.
I would go with the second one cuz
DNA<span> and RNA </span>consists<span> of nucleic acid </span>chains<span> called nucleotides. Nucleotides are </span>composed<span> of three units: base, sugar (monosaccharide) and phosphate. Bases are found in both </span>DNA<span> and RNA. </span>
Phenotype is physical appearance, so if you have (Bb) or (BB) then you’d have brown eyes because that genotype is dominant.
Answer:
a or c i dont really know which one
Explanation: