572 



INTERRELATIONSHIPS OF ORGANISMS 



NATURE'S HOUSE THAT JACK BUILT 



that eats the 





y-vf. 



GRASS 

 (hot grows in the 



EARTH 

 about us 



Fig. 33.6. The "pyramid of numbers" — a graphic representation of food-chain relation- 

 ships among organisms. (Based on an exhibit in the Royal Ontario Museum, Toronto, Canada.) 



