WHAT KINDS OF THINGS ARE LIVING? 23 



20. Origin. We do not know anything about the first appear- 

 ance of life upon the earth, but we do know that every plant 

 and animal now living had its origin in the body of some other 

 plant or animal. In general, non-living bodies do not reproduce 

 themselves ; they do not produce other objects, either like them- 

 selves or different ; but, so far as we know, living bodies can 

 be produced only by other, similar, living things. 



WHAT KINDS OF THINGS ARE LIVING? 



1. Great diversity among living things 



Need for breaking up material for comparison 

 Forms Chemical composition 



Structures Activities 



2. The parts of a plant (seed-bearing) 



Root 

 Shoot 



Stem 



Leaves 



Flowers 



Fruits (seeds) 



3. The parts of an insect (grasshopper) 



Head 



Mouth 



Eyes 



Compound ; simple 



Antennae 

 Thorax (segmented) 



Legs 



Wings 

 Abdomen (segmented) 



Breathing organs (spiracles) 



Hearing organs 



Reproductive organs 



4. The parts of the human body 



Head Trunk 



Mouth Arms 



Eyes Legs 



Nose 

 Ears 



