NATIONAL OPEN UNIVERSITY OF NIGERIA 
        
                           FACULTY OF HEALTH SCIENCES 
        
                 DEPARTMENT OF ENVIRONMENTAL HEALTH SCIENCES 
        
                        COURSE CODE: EHS202 
        
                                             
                              
        
        
       COURSE TITLE: INTRODUCTION TO ECOLOGY AND ENVIRONMENTAL  
                        SCIENCE 
        
                                                 
              
              
             COURSE  
             GUIDE 
              
              
             EHS202: INTRODUCTION TO ECOLOGY AND ENVIRONMENTAL SCIENCE  
             Course Developer/Writers:       Professor A. J. Nayaya 
                                             Department of Biological Sciences 
                                             Abubakar Tafawa Balewa University  
                                             Bauchi, Bauchi State 
                                 
                                             Ass. Prof. A. S. Dan-kishiya  
                                             Department of Biological Sciences  
                                             University of Abuja   
              
             Course Editor:                  Professor Grace C. Okoli 
                                             Department of Environmental Health Science 
                                             National Open University of Nigeria  
              
             Course Coordinator:             Professor Grace C. Okoli 
                                             Department of Environmental Health Science 
                                             National Open University of Nigeria  
              
             Technical Support:              Dr. Florence N. Uchendu 
                                             NOUN  
              
             Programme Coordinator:          Professor Grace C. Okoli 
                                             Department of Environmental Health Science 
                                             National Open University of Nigeria  
                                                          
             National Open University of Nigeria 
             Headquarters 
             91 Cadastral Zone 
             Nnamdi Azikiwe Expressway,  
             Jabi Abuja 
             Nigeria 
              
              
                                                                                             
        Abuja Annex 
         
        245 Samuel Adesujo Ademulegun Street 
         
        Central Business District 
        Opposite Arewa Suites Abuja 
        E-mail: centralinfo@nou.edu.ng 
         
        URL: www.nou.edu.ng 
         
        National Open University of Nigeria 2018 
         
        First Printed 2018 
         
        ISBN: 
         
        All Rights Reserved 
         
        Printed by…………………………………. 
         
        For 
         
        National Open University of Nigeria 
         
        Headquarters 
        91 Cadastral Zone 
        University Village 
        Nnamdi Azikiwe Express Way 
        Jabi, Abuja 
         
        e-mail: centrainfo@nou.edu.ng  ur/: 
        www.nou.edu.ng 
         
         
         
         
                                                           
           
           
          COURSE  
          GUIDE 
           
          CONTENTS                                              PAGE   
          Introduction……………………………………………………………….  
          What you will Learn in this Course……………………………………….   
          Course Aims……………………………………………………………….  
          Course Objectives…………………………………………………………  
          Working through this Course………………………………………………  
          The Course Material………………………………………………………..  
          Study Unit…………………………………………………………………  
          Presentation Schedule……………………………………………………..  
          Assessment…………………………………………………………………  
          Tutor-Marked Assignment………………………………………………… 
          Final Examination and Grading……………………………………………  
          Course Marking Scheme……………………………………………………  
          Facilitators/Tutors and Tutorials…………………………………………….  
          Summary……………………………………………………………………