Because there are no worms or microscopic organisms in the soil so when dead leaves fall they don't die away quickly.

Below the level of animal life we have long known that there are microscopic organisms.

We saw what the drug did to just one microscopic organism.

Many scientists and doctors in history figured out that diseases are caused by microscopic organisms.

If they were microscopic organisms, we would call them parasites.

The test can produce an accurate result with five or fewer of the microscopic organisms in the sample.

A virus is a microscopic organism that causes infection and disease.

Eventually, however, both sides determined they had similar microscopic organisms.

Until then, the existence of such microscopic organisms was entirely unknown.

More extensive testing can be done by looking for certain microscopic organisms.