The answer would be flock
        
             
        
        
        
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a system whereby the government undertakes to protect the health and well-being of its citizens, especially those in financial or social need, by means of grants, pensions, and other benefits. The foundations for the modern welfare state in the US were laid by the New Deal programs of President Franklin D. Roosevelt.
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sedimentary rocks are types of rocks that are formed by the accumulation  or deposition of small particles and subsequent cementation of mineral or organical particles on the floor of oceans or other bodies  of water at the earths surface
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I would guess giant pandas because they aren't referring to a regular panda. giant pandas are a type of panda that live in Asia. then there are other types too. my second guess would be humans just because there are no other "species" or type of human but the pure form of human.