What is the contribution made to the development of the microscope by anton van leeuwenhoek?

1.first to document careful observations of different cell types
2.identifying the first cell
3.used mathematics to improve the focus of the lens
4.created the first microscope
5.discovered the electron microscope
6.built microscopes capable of magnification of up to 1250 x using regular light

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h, o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.