How is earth most likely to change in a place that experiences extensive animal activity

Sand dunes will be formed due to deposition of sediments. Soil will loosen due to vast network of underground tunnels. Cracks will appear in rocks due to freezing and thawing of water.

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.