select the correct answer.

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.

B)

Explanation:

In 1676, van Leeuwenhoek observed water closely and was surprised to see tiny organisms - the first bacteria observed by man. His letter announcing this discovery caused widespread doubt at the Royal Society but Robert Hooke later repeated the experiment and was able to confirm his discoveries.

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.