Why are scientists who are searching for life on other planets studying archeabacteria

Archaebacteria can survive in extreme environments similar to those on other planets and are good indicators of how extra-terrestrial life would function.

Explanation: Archaebacteria resemble the earliest cells found on Earth and are extremophiles who can live in hot, acidic environments without oxygen (anaerobic).

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

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.