Small Yellow Balls on Soil

Question

Is it possible that the small yellow balls in the soil could be fertilizer? We don’t know if new plants or soil were recently added.

Answer 1

It is most likely a fungus (mushrooms). Here is more information: https://www.gardeningknowhow.com/houseplants/hpgen/getting-rid-of-mushrooms-growing-in-houseplant-soil.htm