During photosynthesis, is oxidized, while is reduced.

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm