The lone pairs in the following compound are: 
Definitions:
Ferns
Non-flowering vascular plants that reproduce via spores and have fronds, part of the Pteridophyta division.
Vascular Plants
Plants that have specialized tissues for transporting water and nutrients throughout the organism, including ferns, conifers, and flowering plants.
Phylum
A phylum is a classification level in biological taxonomy that is below kingdom and above class, used to group together organisms that share a basic body plan.
Rhyniophyta
An extinct group of early vascular plants from the Silurian and Devonian periods.
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