Answer. Key. Directed. Reading. ac SECTION: VERTEBRATES IN THE SEA AND ON LAND 1 . The tissue of vertebrates is organized into organs, and the organs are ... The necessary innovations were legs, lungs, and a more efficient heart. 1 3 .
Title | : | Cr 32 Intro/Vertebrates Biology 2004 |
Author | : | Holt Rinehart & Winston |
Publisher | : | - 2004-01-01 |
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