Swelling in the extremities can be the result of water leaving the arterial ends of capillaries faster than it is reabsorbed through the venous ends. this is often seen in what disease?
1- diabetes
2- hypertension, or high blood pressure
3- hypotension, or low blood pressure
4- dehydration

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?