Snails were discovered in the Negev desert at night,harvesting the lichens that grew in the moist pores of the limestone and wearing down the desert more than abrasion from wind.Scientists studying these snails added mild acid to the snail feces and it foamed;this was an important test to detect that

Question

Quizplus · Accepted Answer

The foaming reaction when mild acid was added to the snail feces indicates the presence of calcium carbonate, which is a component of limestone. This suggests that the snails ingested some limestone along with the lichen.

Snails Were Discovered in the Negev Desert at Night,harvesting the Lichens