how come these eggs stay in the stomach for weeks s at a time, embryos thatat little frog leles foweekeks at a time and not be digested? as it turned out, studies in the 1980's began by australian biologist found out the tadpoles were secreting a substance which deactivated the stomach lining. it was not producing digestiveve enzymes. it was inhibititing the stomacah activity and enabling it to serve as a uterus. there are some unfortunate syndromes in humans called ulcer's involving the lining of the stomachch caused by over secretion of digestive enzymes. these frogs were steady in the sense thatat hopefully it t migt provide some means of controlling human stomachh ulcers. the tragedy comes in that thehe species were only discovered in the 1980's. within a few years, thehey went extinct i in nature. ultimamately, those animals died out and the species was lost forever. they cannot bebe studied and longerer. a arctic ice e is turningng the survrvival of t the polar b with a loss of the polar bear may come the loss of potential medicines for diseases like osteoporosis, kidney failure, an