Answer: The best example of human genetic adaptation to climate is skin color, which likely evolved as an adaptation to ultraviolet radiation. Variation among populations in body size and shape also may be at least partially related to adaptation to climate 
Hope this helps:))
        
             
        
        
        
Answer:
Substitutes are goods where you can consume one in place of the other. 
Explanation:
 The prices of complementary or substitute goods also shift the demand curve. When the price of a good that complements a good decreases, then the quantity demanded of one increases and the demand for the other increases.
 
        
                    
             
        
        
        
Answer:
1) Military: domination: the line was built to exercise ‘effective control’ in the Scramble for Africa, or to dispatch troops for better control of the native population;
2) Mining: the line was built into the interior to further European mining interests, and;
3) Cash crops: the colonial power built the line to connect agriculturally rich areas. With limited budgets, colonisers expected the railroads to pay for themselves, hence they connected areas of high economic potential.
Explanation:
History :D
 
        
             
        
        
        
Liberty generally allows people to fulfill their goals and personal wishes: this means that there is nothing in the way of people to achieve their goals. 
One prize that is connected to liberty is safety: personal liberty applies to everyone, so it also means that other people might be less restrained from hurting us.