204 THE FITNESS OF THE ENVIRONMENT 



CH 3 CH 3 CH 3 CH 3 



I I I I 



CH 2 CHOH CH COH 



I I II II 



CH 2 OH CH 3 CHOH CH 2 



CH 2 OH CH 2 



I II 

 CH C 



II II 

 CH 2 CHOH 



CH 3 CH 2 OH CH 3 CH 2 OH CH 3 CH-OH 



I I I I I I 



C C CHOH CHo COH CH 



III III || II II 



COH CH CH>OH CH 2 OH CHOH CHOH 



