Competitive rivalry based solely onis destructive to firms as it transfers most of the value created in the industry to the customers. a) price-cutting. b) new product releases. c) promotional campaigns. d) product differentiation.

a) price-cutting

Explanation:

Due to the cutting in prices of the product for the competitive rivalry it creates a destructive to a firm as it transforms most of the values that are developed to the industry to the customers

The other factors like the introduction of the new product, promotional campaigns, product differentiation does not have made any destructive

Therefore the correct option is B.

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.'