Anton van Leeuwenhoek used a microscope to observe tiny creatures swimming in a drop of pond water.
How did his observations contribute to the cell theory?
A. He showed that living cells come from other living cells.
B. He was the first person to observe and identify living cells.
C. He was the first person to observe dead plant cells.
D. He showed that all plants and animals are made of cells.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.