Choose of the following best describe tropism. True tropism requires plants to grow. Tropism is the only cause for plant growth. Tropism will cause plants to react to both internal and external stimuli. Tropism causes plants to produce oxygen.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.