(problem 25) mutations in which lac operon gene or region are trans in its effect on the regulation of the operon?

Which best describes the scientific process

Below are the three main organs that make up the plant body.

In 1994, telomerase activity was discovered in human cancer cell lines. although telomerase activity is rarely present in human somatic tissue, this discovery indicated that humans do contain the genes for telomerase proteins and telomerase rna. since inappropriate activation of telomerase may contribute to cancer, why do you think the genes coding for this enzyme have been maintained in the human genome throughout evolution?