The fossil fuel which is the remains of ancient plants is: A. Coal.
Non-renewable energy can be defined as a type of energy that is mainly generated through artificial sources or from the remains of ancient plants.
Hence, a non-renewable energy cannot be replenished or renewed like the renewable energy sources.
Basically, some examples of a non-renewable energy include:
Coal deposits are typically petrified peat swamps and peat is generated from decaying plants.
Also, coal has been discovered to be a fossil fuel that contain the remains of ancient plants, based on radioactive dating.
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