BIOL 102 Lecture Notes - Lecture 11: Cambrian Explosion, Unicellular Organism, Collagen
Document Summary
Heterotroph: early animals and the cambrian explosion. Evolved from colonial agellated protist (which acted like a link between unicellular and multicellular organisms) The most common protein in out body. Little snow akes: what is an animal. Muscle cells and nerve cells that control the muscles. Proceed through series of typically similar developmental stages: animal phylogeny. How their body is structured (morphology: 3 main lineages, no de nite shape, asymmetrical. 2. radial symmetry - - can be divided into multiple segments: bilateral symmetry - - can have two equal segments, asymmetrical forms. Lack de ned tissues or organs (such as sponges: radial symmetry. Stationary polyp stage (most stay in this phase for most of the lifespan) Gastropods - - live on land and sea. Free living in various types of water. Large gastrovascular cavity is good for absorbing nutrientsand giving them more surface area. Painful parasites that infect people due to water contamination in parts of africa.
