152 COXJUGATIOX, MATURATIOX, AND FERTILIZATIOX 



marked sexual dimorphism, the manifestations of maturitv showing in 

 greatly reduced size and relatively great kinetic energy on the one 

 part, and increased nutritive potential and relative sluggishness on 

 the other. For purposes of description these various conditions are 

 usually grouped under the headings isogamy (fusion of ecjual gametes) 

 and anisogamy (fusion of dissimilar gametes). 





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