380 REPRODUCTION 



species are usually not alike, so that in a sense the two types compete. 

 Apart from the relatively trivial generalization that the larger sexual 

 structures must require more energy for their formation than the (usu- 

 ally) smaller asexual organs, there is as yet no good evidence for a 

 universal difference between sexual and asexual reproduction; this 

 possibility, however, should surely be explored. A few instances have 

 been noted in which two different asexual structures have different 

 requirements. 



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