The bottom-up approach for estimating times and costs that uses costs from past projects that were similar to the current project is known as Multiple Choice phase estimating. template method. detailed WBS work package estimates. time-phased cost estimates. function point method.

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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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answerpublish a notice of the proposed rulemaking proceeding in the federal register;