BIO 1130 Study Guide - Final Guide: Cambrian Explosion, Burgess Shale, Symmetry In Biology

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

Document Summary

An invertebrate lacking a coelom or body cavity. The diversification of a group of organisms into forms filling different ecological niches. Moves through the body cells supplying nutrients, removing waste, and transporting sperm during sexual reproduction. The sperm of nematodes which is the only sperm which uses amoeboid movement rather than flagellar. The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. Tend to be streamlined, show a central nerve center and cephalization (neural and sense organs centralized at one end the head) Have a shell consisting of two halves hinged together. Many types all similar, live in both fresh and salt water enviornments. Typically develops into the anus in deuterostomes and the mouth in protostomes. The hollow ball of cells marking the end stage of cleavage during early embryonic development. After the blastula develops, it undergoes transition to the gastrula, a process called gastrulation. Marine or freshwater animals that form colonies of zooids.