Results 1-2 of 2
... substantially larger percentage of the Earth than today. The Devonian was
characterized by varied faunal and floral life forms. Among the marine
invertebrates, the bivalve brachiopods and conodonts became highly diversified
and abundant ...
In bivalves such as the clam, the gills, larger than necessary for respiration, also
function to strain suspended material out of the water. Hairlike filaments called
cilia produce a water current over the gills and other cilia move the trapped food ...
What people are saying - Write a review
LibraryThing ReviewUser Review - keylawk - LibraryThing
This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review