Burning wood and fossil fuels increases in the atmosphere A carbon dioxide
B nitrogen
C oxygen

A. Carbon Dioxide

Explanation: This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2

Burning wood and fossil fuels increases Carbon Dioxide in the atmosphere.

Explanation: I hope it helps! :)

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.