Đang chuẩn bị liên kết để tải về tài liệu:
FISH AND AMPHIBIANS (Britannica Illustrated Science Library)

The earliest amphibians evolved in the Devonian Period from sarcopterygian fish with lungs and bony-limbed fins, features that were helpful in adapting to dry land. They diversified and became dominant during the Carboniferous and Permian periods,but were later displaced by reptiles and other vertebrates. Over time, amphibians shrank in size and decreased in diversity, leaving only the modern subclass Lissamphibia. | About the pagination of this eBook Due to the unique page numbering scheme of this book the electronic pagination of the eBook does not match the pagination of the printed version. To navigate the text please use the electronic Table of Contents that appears alongside the eBook or the Search function. For citation purposes use the page numbers that appear in the text. FISH AND AMPHIBIANS Britannica Illustrated Science Library Encyclopedia Britannica Inc. Chicago London New Delhi Paris Seoul Sydney Taipei .