According to sources, the most probable answer to this query is electron transport chain is a step in cellular respiration that is responsible for producing the energy currency of the cell, ATP.
Thank you for your question. Please don't hesitate to ask in Brainly your queries.
I believe the answer to this is substitution <span />
Hii this isn’t about answering your question, don’t press the links ppl give you in the comments they’re old men selling people into sex traffic by you pressing their link and them getting access to your IP address, anyways have a good day!!!:)