It would have 20 protons, 20 neutrons, and 20 electrons. Protons and electrons are USUALLY (I say usually because of the different types of atoms) the same as the atomic number. To find neutrons you take the atomic mass minus the atomic number. 40-20=20
The two substances needed in this situation are:
potato extract and catechol<span />
Respiration is a chemical reaction that takes place in cells and allows them to release energy. Reactants are the substances that react together in a chemical reaction. In respiration the reactants are glucose and oxygen.
It would be an opaque Object <span />
epithelial<span> tissue lines the interior and exterior body surfaces; connective tissue provides support for the body and connects its parts; </span>nervous<span> tissue carries messages in the form of nerve impulses throughout the body; and muscle tissue is responsible for voluntary </span>