LIVING IN OUR ENVIRONMENT 39 



change improve nervous framework 



adaptations blood structure muscles 



doing friend adapted successful 



cartilage adapt endocrine efficiently 



movement muscle food drink 



enemy tendons adaptation unsuccessful 



The human body has numerous complicated (1) which 



enable us to live (2) The hand is an example of an organ 



(3) for grasping or writing. It has a (4) of bones, loosely 



jointed with pads of elastic (5) between. Thirty-one (6) 



help to give (7) to these bones. Each (8) is attached 



to one or more bones by tough cords called (9) The whole 



apparatus is controlled by the (10) system. Adaptations are 



not always (11) , they may be (12) ways of (13) things, 



such as getting (14) or escaping from an (15) Man is 



the only living thing that can successfully (16) the environ- 

 ment to himself. He can (17) it or (18) it, making an 



(19) in that way. 



STORY TEST 



WALTER WRITES ABOUT ADAPTATIONS IN MAN 



Read carefully and critically. List all the errors and suggest cor- 

 rections. 



Animals and plants seem to be able to get along by means of 

 adaptations. These are usually structures which make it possible 

 for the plant or animal to live successfully where it happens to be. 

 But man, who is able to travel and to change his place of living, 

 does not have any such structures. He is the master of his sur- 

 roundings and can change them to suit himself. If, for example, 

 he is cold, he can put on more clothes or go where it is warmer. 

 Of course a man has arms and legs, but they are in no way like the 

 front and hind legs of a cat or dog. Since man can adjust himself 

 so well to new conditions, he does not need adaptations. 



THE REVIEW SUMMARY 



In preparing a summary of what you have learned in this unit, 

 you will want to place emphasis on the big ideas which have come 

 out of the applications of the facts you have learned and the demon- 



