Shoppers on Amazon have differing needs that must be satisfied during the exchange, which often include the need for information, convenience, variety, and/or pre- or postsale services. These needs are collectively referred to as

buyer requirements

Explanation: Differing needs such as the need for information, convenience, variety, and/or pre- or postsale services that  must be satisfied during an exchange are collectively known as buyer requirements which aid both buyers and sellers in the ordering process as they allow the seller to ask for any information needed to complete an order while allowing the buyer to communicate his/her needs to ensure that every order specification is met.

answer; i believe the correct answer is (business necessity defense;

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.'