Which of these sentences has context clues to find the meaning of the word "obsolete"?
the valuable foot-pedal sewing machine in my living room is obsolete.
among tech experts, the desktop computer is often considered obsolete.
the car engine was obsolete, making it difficult to repair.
the flip phone became obsolete as newer technology arrived on the market.

Living organisms release energy gradually to prevent most of the energy from heat loss. The cells release the chemical energy present in food and it should be utilized gradually to prevent the energy loss in the form of heat and light.Most of the energy released by the body is through cellular respiration.The energy is produced by the continuous process that occurs in the body ,breakdown of food and energy production.If a huge amount of energy will be released from the body it will only be in the form of heat loss so to prevent the energy from lost in the form of heat living organism release energy gradually