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

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

A) the snails digested and derived nutrition from breakdown of the limestone rock.
B) the snail was excreting uric acid.
C) some limestone was actually scraped off and ingested with the lichen.
D) the lichen had some food value.
E) not all food was digested.

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