Description: A study of the adaptions of organisms to their environment and of the interrelationships among organims which determine the structure and attributes of natural populations and biological communities.  Field trips and laboratory exercises use sampling methods and statistical techniques in the analysis of the response of organisms to their physical environment, of selected population phenomena, and of different natural communities.   Several field trips are required during the term.  Prerequisites: Biology 152L and 153L, and permission of the instructor.  Biology 222L and 215L are recommended, but are not prerequisites.  ( 1.25 course credits)