select the correct answer.\nwhat was anton van leeuwenhoeks contribution in the development of cell…

select the correct answer.\nwhat was anton van leeuwenhoeks contribution in the development of cell theory?\na. he built the first compound microscope.\nb. he was the first to observe live cells in a sample of pond water.\nc. he concluded that cells exist in liquids.\nd. he stated that all living things are made of cells.
Answer
Brief Explanations:
Anton van Leeuwenhoek used a simple microscope of his own - making to observe single - celled organisms in pond water, which were the first live cells observed. The first compound microscope was not built by him. Concluding cells exist in liquids is not his main contribution, and stating all living things are made of cells was part of the work of other scientists like Schleiden and Schwann.
Answer:
B. He was the first to observe live cells in a sample of pond water.