✏ANSWER

A Dutch lens maker, who first observed microscopic organisms such as protists and bacteria.

a. Anton Van Leeuwenhoek c. Theodor Schwann

b. Robert Hooke d. Matthias Schleiden

• A. Anton Van Leeuwenhoek

Explanation:

Antonie Van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa.

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Answer:

A Dutch lens maker, who first observed microscopic organisms such as protists and bacteria.

• a. Anton Van Leeuwenhoek

Explanation:

He used a single - lens microscope to make observations about bacteria and protoza.

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