Robert Hooke and Antoni van Leeuwenhoek both are credited for the discovery of[[1]].

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Detailed Solution

Concept: Tiny, microscopic organisms are called microorganisms. They include bacteria, algae, viruses, fungi and protozoa. They can be either prokaryotic or eukaryotic. They are found in every type of habitat.
Robert Hooke and Antoni van Leeuwenhoek both are credited for the discovery of microorganisms. Hooke was the first one who described structures of molds in the year 1665. In 1676, Antoni van Leeuwenhoek observed microscopic protozoa and bacteria. These microorganisms are both useful and harmful for us. They can cause a number of diseases in humans.
Hence, microorganism is the correct answer.

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