What is the difference between a retail market and a wholesale market? A.
Retail markets are in urban areas, whereas wholesale markets are in rural areas.
B.
Retail markets are at transport hubs, whereas wholesale markets are at central places in villages.
C.
Retail markets sell only organically grown produce, whereas wholesale markets sell all types of produce.
D.
Retail markets sell directly to consumers, whereas wholesale markets sell primarily to traders and retailers.

D. Retail markets sell directly to consumers, whereas wholesale markets sell primarily to traders and retailers.

Explanation:

Retailers are the last traders in the distribution chain.  They buy goods in bulk from wholesalers,  break the bulk and sell the goods in small quantities to consumers. Retailers are found in all areas, including towns, estates, and rural areas. Large-scale retailers such as supermarkets buy directly from manufactures and sell to retailers.

Wholesalers are intermediaries in the distribution chains. Their primary customers are retailers. Wholesalers buy from manufacturers in bulk, break the bulk and sell to retailers. Some wholesalers have created channels for selling to consumers.  

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

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