The correct answer is Chemical. Because two substances are reacting and creating a new substance.
Atom,molecule,cell,tissue,organism,population,ecosystem,biosphere.
<span>s that a single on off switch can control the whole cluster of functionally related genes; these genes are coordinately controlled (ex: when Ecoli must make tryptophan for itself because the nutrient medium lacks this amino acid all the enzymes for the metabolic pathway are synthesized at one time)</span>
Cementation, Hope this helped.
