Physics
In which of the following processes is energy released ?

Absorption
Respiration
Ingestion
Photosynthesis

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a lower density than metals
metals are good conductor of heat
metals have higher thermal capacity than plastics
plastics have a higher thermal conductivity than metals

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