What was anton van leeuwenhoek's contribution in the development of cell theory? a. he built the first compound microscope. b. he was the first to observe live cells in a sample of pond water. c. he concluded that cells exist in liquids. d. he stated that all living things are made of cells.

Anton van Leeuwenhoek is commonly known as the Father of Microbiology.

He was the first man to witness a live cell under a microscope or we can say, he discovered protozoa (the single-celled organism) and he named them animalcules.

So, option B is the correct answer.

B. He was the first to observe live cells in a sample of pond water.

the answer is c a tornado