<span>We are to identify which among the given choices is not part of the lac operon genes. Lac operon consists of three structural genes which include the promoter gene, the regulator gene, and lastly the operator gene. From the given choices, the one that is not included is the repressor. </span>
Biotic factors include plants, animals, microbes, etc. The important abiotic factors include the amount of sunlight in the ecosystem, the amount of oxygen and nutrients that is dissolved in the water, temperature, etc. Sunlight is one of the most important abiotic factors for marine ecosystems.
