BIOL211 Lecture Notes - Lecture 1: Amnion, Chordate, Hagfish
6 Dec 2014
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Document Summary
Vertebrates are one of the most important and abundant groups of animals on earth. We are vertebrates, so when we learn about vertebrates we learn about ourselves and about the animal models most useful in medical research. Vertebrates include most of the animals we use in agriculture or wish to manage as natural resources. We know more about the evolution of vertebrates than any other group of animals: vertebrates. Very diverse more than 63,000 extant species of vertebrates. Have complex and diverse body forms and habitats. Life is energetically expensive get energy from food. Carnivores eat flesh of other animals. Herbivores eat plants: groups of vertebrates, major extant groups. Two major groups of vertebrates amniotes & non-amniotes: non-amniotes embryos enclosed by membranes produced by the female reproductive tract, amniotes embryonic development results in the formation of the amnion that surrounds the embryo. Hagfishes & lampreys limbless, elongated boneless scavenger/parasites that lack jaws.
