Precipitation is more likely to occur (a) when the air is saturated (b) when condensation nuclei are present (c) when warm air rises and cools (d) all of these (e) none of these

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?