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The two distinguishing features of mammals are the presence of __?
D. Hairy and mammary glands
The two distinguishing features of vertebrates are the presence of__?
B. A post-anal tail and pharyngeal gill slits
How do lampreys differ from all other extant vertebrates?
C.They lack both jaws and paired appendages.
What was the origin of the bones that became modified to form the vertebrate jaw?
D.The jaw bones formed by modification of the pharyngeal gill slits.
Two features of ray-finned fish NOT found in sharks are __?
B. A swim bladder and opercula
The gill flap, or operculum, was an important adaptation for ray-finned fish because it helps with __?
B. Maintaining a supply of oxygenated water moving across the gills
The first vertebrates to live on land were most likely derived from __?
C. lobe-finned fishes
Most amphibians have two key characteristics that tie them to water or at least damp habitats. What are they?
D. use of skin for gas exchange and soft, jelly-covered eggs
The development that freed vertebrates from water for reproduction and allowed them to radiate into diverse terrestrial environments was the __?
C. evolution of the amniotic egg