The present value of a zero-interest-bearing note given for property, goods, or services should be measured by A : using the prime interest rate to discount the note. B : the book value of the property on the seller's books the interest rate on similar notes being offered in the market place for similar property, goods, or services. C : the fair value of the property, goods, or services or by an amount that reasonably approximates the fair value of the note. D : using a negotiated interest rate between the issuer of the note and the owner of the property, goods, or services to discount the note.

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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.'