LIFE IN STREAM AND POND 



28? 





larvae of many dif- 

 ferent flies live in 

 tubes fastened to 

 stones. You can 

 learn to identify 

 these in any good 

 book of aquatic in- 

 sects. Some insects 

 live on the surface 

 film of the water, 

 while others, as the 

 water boatman and 

 water bug, swim 

 near the surface. 



Look in Down- The life cycle of the dragon fly. How does the 

 ing's "Our Liv- larva catch its foods? What happens before the 

 ITT i i j > f adult is hatched out ? 



ing World/' if 



you want to learn more about these interesting forms. 



SELF-TESTING EXERCISE 



Select from the following list the words which best fill the blank spaces 

 in the sentences below and arrange the words in proper numerical order. 

 A word may be used more than once if necessary. 



fishes 

 adults 

 stems 

 frogs 



held down 

 buoyed up 



lizards 



mollusks 



a'daptations 



webbed 



long 



flowers 



larvae 



divided 



jellyfish 



toads 



crustaceans 



lobsters 



embryos 



slimy 



turtles 



gills 



algae 



seaweed 



Things which live in the water show (1) for this kind of 



life. Plants have finely (2) leaves and (3) thin (4) , 



because they are (5) by the water. Aquatic animals are 



likely to have (6) , fins, (7) feet, or (8) body. In 



brooks we are likely to find (9)_ 



(10) , which lay their eggs in masses of jelly; 



such as minnows or chub, 

 (11) , which 



have to come to the surface to breathe, (12) , as snails, mussels, 



or clams ; (13) which have jointed legs and bodies covered with 



a hard skeleton, and many insects, both (14) and (15) 



