BIOL 1202 Chapter : Chapter 32 Learning Objectives
Document Summary
Concept 32. 1: animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers. List the five characteristics that combine to define animals: animals ingest food and then digest it, multicellular, eukaryotic, reproduce sexually, nervous and muscle tissue. Concept 32. 3: animals can be characterized by body plans : distinguish between radial and bilateral symmetry. Explain how animal symmetry may match the animal"s way of life: radial symmetry- flower pot does not have right and left sides. Any slice through the central axis divides the animal into mirror images: bilateral symmetry- shovel has right and left sides. Only one imaginary cut divides the animal into mirror-image halves: many radial animals are sessile (living attached to substrate) or planktonic- their symmetry helps them meet the environment equally from all sides. Most bilateral move and have a central nervous system that enables them to coordinate walking, flying, etc: distinguish among acoelomate, pseudocoelomate, and coelomate grades.
