Which statement is most likely the explanation of why certain animals are able to adapt to changing environments ? A. Some species have unlimited habitats.
B. Some species react by an immediate mutation.
C. Some species have mostly dominant genes.
D. Some species have a greater variation in their genetic make-up.

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.