Explanation:
Here r the things thet upset the ecological balance
1 Deforestation 
2Over population
3 Burning of fossil fuel
4 pollution
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The correct answer is letter D
Explanation: Only through reason could a new nation protect the rights of the people.
 
        
             
        
        
        
Answer:
False
Explanation:
The term for a child who has no parent or guardian or whose parents are unable to give proper care is dependent child.
A delinquent is a person who commits felony.
 
        
             
        
        
        
Answer:
Field research. 
Explanation:
Since the sociologist studied the learning capacity of toddlers by joining a preschool for six months, he has likely conducted a field research or a field study. Field research is the collection of raw data outside a laboratory or a library. It is a qualitative method of data collection that aims to observe, interact and understand people while they are in a natural environment. It focuses on capturing live experiences.