What happens to the pyruvate that enters the Krebs cycle?

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen