Anton von leeuwenhoek first observed single-celled organisms with a simple microscope in the 17th century. cell theory was not fully formulated until several hundred years later with the development of more complex microscopes. which of the following best explains how the invention of complex microscopes impacted cell theory?
a) It led to the discovery of DNA.
b) It facilitated the observation of single-celled organisms.
c) It disproved the concept of cells.
d) It caused a decline in the study of biology.
