BIO 1130 Lecture Notes - Lecture 9: Arthropod Cuticle, Mollusca, Continental Shelf

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Silurian 443-416 ma age of plants (plants start appearing on land) Devonian 416-359 ma age of fishes (fish/first vertebrates appear in the. Permian 299-245 ma 90% of the biodiversity die off in a mass oceans) extinction. Burgess shale give us a look at the very first starts of life. Explosion of animal forms that most of them didn"t make it through evolution over. So much diversity evolutionary arms race for predator and prey. Sat there on its butt and used flagellum to beat the water so that food can get in. Tissues things that help stuff move between cells (cell to cell communication) None, diploblastic (two layer skin), or triploblastic (mesoderm muscle tissues) (three layer skin) Asymmetry, radial (like jellyfish), and bilateral symmetry (one axis to split) Coelomate, pseudocoelomate, acoelomate (no coelom/ no body cavity) Use of choanocytes in an aquiferous system. Totipotent cells any cell can dedifferentiate and turn into a different cell type.