Reef - building coral are marine animals with single - celled algae living in their tissues . The coral provides protection for the algae and the algae provide food for the coral . Which of these statements best explains what would happen to the coral if the algae die ?

a symbiotic relationship with the mitochondria

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.