([lemma=","] [tag=CC | lemma=engender])? [tag=IN] [□=□]?
([lemma=","] [tag=CC | lemma=engender])? [tag=IN] [tag=□]?
([lemma=","] [tag=CC | lemma=engender])? [tag=IN] [lemma=□]?
This may be explained by an observation that ' snails which have ascended trees , walls , etc. do not climb back the way they have come , but let themselves drop down . The snail then has choices : it may repair it , replace it with a new one , add an additional one , or go into a period of activity . Use of these data in publications , dissertations & theses , or other scientific reports , should be accompanied by an acknowledgement of the Department of Ornithology & Mammalogy , California Academy of Sciences , as the source for the information . Although it had long been understood that some colubrids are venomous , the potential threat posed to human life by these species was not really taken seriously until two of the most prominent herpetologists of the twentieth century found out the hard way that some colubrids can inflict fatal bites . A - Years ago when you played the wishing game of being any animal in the world , did you ever want to be a slug ? This conversion of a vague locality description into a single subjective point creates the problem of false precision , often to a scientifically unacceptable degree . Triassic Period , 200 million years ago , all the land masses were united into a single continent called Pangea . The natural history collections community is about to be confronted with the fact that collection databases we've been building for the last 20 years ca n't deliver on their potential because the data have not been translated into a machine-usable form . After several hours of tedious still photography , we pull out the cobra we had caught two nights ago for some video footage . Wait until a snail 's tentacles are stretched out fully . As an indication of how much body processes are slowed down , a hibernating pulmonate at 30oF will use as little as 1/50 th the amount of oxygen used by an active snail at 59oF . A - In the air-breathing pulmonates the interior of the mantle cavity is converted into a lung and a pumping mechanism for renewal of air is established .