Cell is a basic unit of all living things Life processes

Crustaceans are second group of arthropods

The abdomen is the rear part of an insect’s body

The thorax is the middle part of an insect’s body

The antennae help the insect smell and feel

To molt is to shed the hard outer covering

An insect called the boll weevil damages the cotton crop

CHAPTER 3

1. 
   Fish are vertabrates that live in the water
   
2. 
   A cold-blooded animal is an animal whose body temperature changes with
   

the temperature of the water or air around it

3. 
   Cartilage is a soft, bonelike material that bends
   
4. 
   A fin is a structureon a fish that helps it move through the water
   

An amphibian is a cold-blooded vertebrate that lives part of its life in water
and part on land

5. 
   Lungs are organs through which animals get oxygen from air
   
6. 
   Fishlike animals called tadpoles hatch from eggs
   
7. 
   A reptile is a cold-blooded vertebrate that has lungs and dry skin
   
8. 
   Birds are warm-blooded animals that are covered with feathers
   
9. 
   A warm-blooded animal is an animal whose body temperature stays
   

the same even when the temperature of air or water around it changes

10. 
    Ducks and geese have small fluffy feathers called down near their skin
    
11. 
    A mammal is a warm-blooded vertebrate that is usually covered with
    

fur or hair

CHAPTER 4

1. 
   Everything that surrounds and affects a living thing is called its environment
   
2. 
   The study of how living and nonliving things affect each other called ecology
   
3. 
   An ecosystem is a group of living things and their nonliving environment
   
4. 
   A community is all the plants and animals that live and interact with each
   

other in a place

5. 
   A population is a group of the same kind of living thing in a community
   
6. 
   The special place in a community in which a plant or animal lives is called
   

its habitat

7. 
   The role that each living thing plays in a habitat is called its niche
   
8. 
   A predator is an animal that hunts other animals for food
   
9. 
   The animal that is hunted is the prey
   
10. 
    The series of changes in communities of an ecosystem is called succession
    
11. 
    The first stage of succession is called the pioneer stage
    
12. 
    The last stage of succession is called the climax stage
    

CHAPTER 5

1.