Please helpme ASAP :) BRAINLIST I WILL

How many electrons can occupy any electron orbital?

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?

Compare the role of atp in cells with the roles of rna