402 
MAN AND THE OTHER ANIMALS 
comparison of the life processes of man with those of 
animals. 
Scientists give four reasons in explaining why certain ani¬ 
mals and plants are not adapted to living in all parts of the 
world : (1) lack of suitable food ; (2) failure in adapting their 
lives to the peculiarities of climate; (3) too many enemies; 
(4) inability to raise their young. All these man has been 
able to overcome. 
STUDENT REPORT 
The following table points out some of the common adaptations 
in animals. How are they related to the animal’s success in life? 
Name some other habits which help to protect animals. 
| Active in Summer 
Active in Winter 
Home 
Protection 
Earth 
Water 
Air 
Nest 
Night Feeding 
Day Feeding 
Color 
External Skeleton 
Method of Escape 
Earthworm .... 
Fly. 
House Sparrow . . . 
Dog. 
Man. 
Etc. 
325. Youth, Maturity, Old Age. — The life of man is 
divided into three general periods, which are youth, the 
period of maturity, and the period of old age. These same 
terms are given when describing the life of animals and plants. 
Youth is the period when living protoplasm always grows, 
if furnished with proper food. This is the time when boys 
and girls grow taller and heavier each year; when the tree 
grows new leaves and the limbs become longer; and when 
