Which feature below differentiates endocrine glands from exocrine glands? a. the location of the gland b. what the gland secretes its hormone into c. what organ or tissue is controlled by the gland's hormone d. the effects that the gland's hormone has on the 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?