The rigid layer of nonliving material that surrounds the cell of plants and other organisms is called the
, big test tommorow and i don't understand it, have to get a good grade on test!

Timed ! in which of these statements are protons, electrons, and neutrons correctly compared? quarks are present in protons and neutrons but not in electrons. quarks are present in protons, neutrons, and electrons. quarks are present in neutrons and electrons but not in protons. quarks are present in protons and electrons but not in neutrons.