Steven puts the two stones in a rock tumbler. the tumbler spins so the rocks bump against each other. when the rocks are removed , he discovers that pebble one experienced more change than pebble two . what can steven best conclude about the stones ?

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?