The Mammals 



mammals have so many things in common and because of 

 the similarity of all the animal forms of this class. 



The basic structure and the organization of all mammal 

 forms are the same. Their anatomical structure is the same 

 or similar In minute detail. They are all warm blooded, 

 air breathing capable of adapting themselves to changing 

 weather conditions or geographical locations. Except in a 

 few cases, they all have four limbs, the front pair of which 

 may terminate either in hands or feet depending on the uses 

 to which they have been put. Generally speaking, they have 

 the same number of bones in the head and trunk. They all 

 give birth to, suckle and care for their young. They are all 

 developed from a single cell and during their embryonic 

 period, repeat again the processes through which all pre- 

 vious forms have passed. They all see, hear, taste, smell 

 and feel. Many of the higher forms, the ascending groups, 

 are Intelligent; they possess the faculty of memory, form 

 ideas and draw conclusions. They play, exhibit anger, 

 hatred, sorrow, love, joy, devotion and affection. These 

 attributes differ in degree only depending on the degree of 

 progress which the respective species has made in the tree 

 of animal life. The forms of the more than 10,000 differ- 

 ent species of mammals are determined by the environments 

 that they have adopted or In which their lot has been placed. 



If proofs that lead to reasonable conclusions be applied 

 to a determination of the origin of the mammals, and If this 

 origin cannot be reasonably explained in any other way, then 

 the only reasonable conclusion based on the evidences of 

 Evolution is that the mammals have sprung from a common 

 reptile-like ancestor; that these ancestors developed a four 



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