15. What's the requirement of every single natural process on Earth? 
answer: Energy source
        
             
        
        
        
 Answer:
The wildlife sanctuaries are established to protect the endangered species.  A few sanctuaries take in injured and abandoned animals and rehabilitate them to health before releasing them in the forest. Wildlife sanctuaries preserve the endangered species and protect them from humans and predators.
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Answer:
The correct answer would be - biological species concept.
Explanation:
The biological species concept is a concept of speciation or how a species forms in nature. According to this, a species is the group of the population that can naturally or potentially interbreed with each other, not on the basis of their physical similarities or habitats.
The physical appearance could be useful as recognizing a species but not defining it. As neanderthals show very little or no gene flow with a modern human it means they do not belong to the same species as modern homo sapiens.
Thus, the correct answer is- biological species concept.
 
        
             
        
        
        
<span>The Growth hormone (GH) is of greatest importance in human development. It is a peptide hormone that stimulates growth, cell reproduction, and cell regeneration in humans. GH is produced by the pituitary gland, and it also helps to regulate body composition, body fluids, and muscle and bone growth.</span>