potting soil
... that the fungus gnat is often found around houseplants because it lays eggs in moist potting soil?
... that the <a href="./Fungus_gnat" id="mwEBA" rel="mw:WikiLink" title="Fungus gnat">fungus gnat</a> is often found around houseplants because it lays eggs in moist <b id="mwEBE"><a href="./Potting_soil" id="mwEBI" rel="mw:WikiLink" title="Potting soil">potting soil</a></b>?