How are the atoms in hydrogen peroxide rearranged in this chemical reaction?

Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?

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

Were you able to observe the nucleolus in any of the cells if so which ones