Bacteroid A modified bacterial cell in a root nodule, typically a cell of the bacterium Rhizobium in the root nudule of a leguminous plant (family Fabaceae).
But in places with lots of life, rain-making particles are often biological in origin, like bacteria, pollen, plant fragments, and spores from mushrooms.
For every 10 medications used by humans, 7 contain chemical compounds that originally came from the natural world, mostly from bacteria, fungi, and plants.
There are poisons that lurk in bacteria, plants, and fungi all over the place, and they're not just found in exotic, tropical locales or, like, 1970's London.