The functioning of enhancers is an example of

transcriptional control of gene regulation

Explanation:

Enhancers are short sequences of DNA involved in the regulation of gene expression. Activators are proteins that bind to enhancers and increase the gene expression (positive regulators). Enhancers are found in both, prokaryotes and eukaryotes and are located usually near the start site.

yes it is weird but true

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.