The superheroine xanaxa, with a mass of 65.9 kg, is in a hair-raising chase after the 76.1-kg arch-villain lexlax. she leaps from the ground to the top of a 183-m-high building, then dives off and comes to rest at the bottom of a 17.9-m-deep excavation, where she finds lexlax and neutralizes him. does all this bring about a net gain or a net loss of gravitational potential energy?
loss or gain?
by how much? answer with a positive number. take g = 9.81 m/s2.
answer j

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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.'

i would say a penny hope it you