Answer:
You need to use the scientific method and <u>knowledge of the environment and earth systems</u> in order to work as an environmental scientist. 
Explanation:
An environmental scientist works based on the fact that it has the knowledge of the environment and he is aware of the interaction between the environment and other components associated with it.
An environmental scientist study about the effect of environment on plants and animals as well as earth systems to protect, understand and develop research methods.
 
        
             
        
        
        
Answer:
They can breathe in oxygen.
Explanation:
By letting it flow over there gills it helps them make oxygen.
 
        
             
        
        
        
Answer: 
for question 1: an organism's behavioral change in response to a change in its environment
for question 2: a mole has a sensitive sense of smell to help it find food underground
for question 3: natural selection
 
        
             
        
        
        
<span>b. Millions of coal fires and stagnant air caused toxic fumes to build up in the air.</span>