What organisms live in a drop of water?

Answer 1

No unless there is biotic factors within the drop(living creatures). These biotic factors must react to each other and provide a niche to the ecosystem also.

"An ecosystem is a natural unit consisting of all plants, animals and microorganisms (biotic factors) in an area functioning together with all of the physical (abiotic) factors of the environment. An ecosystem is a unit of interdependent organisms which share the same habitat. Ecosystems usually form a number of food webs which show the interdependence of the organisms within the ecosystem.[1]" (Wikipedia.com)

Answer 2

Any drop of untreated water, from a lake, a river, or the ocean, is a world in miniature. The drop can contain thousands of tiny organisms, such as algae, protozoans, bacteria, and viruses. Most of these microbes are harmless to other animals, including humans--fewer than 1 percent of bacteria cause disease, for example. Yet those few harmful types of microbes, consumed accidentally in a drink of water, can be dangerous.

Answer 3

A drop of water can contain a variety of microorganisms such as bacteria, protozoa, algae, and sometimes even small multicellular organisms like rotifers or nematodes. These organisms play important roles in nutrient cycling and the overall health of aquatic ecosystems.

Answer 4

Not relay you could have a rock their instead of water to make it an ecosystem. But you need to make sure that their has to be a living thing in their too.