With an aim of a diagram, distinguish between the income effect and substitution effect of change in price of a normal good​

Hello. You did not present a diagram to which the question refers. However, I will try to help you in the best possible way.

The income effect is the term related to the increase or decrease in the consumer's purchasing power in relation to the fluctuation in the price of consumer products and the value of the national currency. On the other hand, the substitution effect refers to the impact between the variation of the consumers' income value and the product's prices.

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.'