Answer:
H2O2 H2O CO CO2 CH4 are all compounds.
Explanation:
Compounds contains 2 or more ions of different elements in different proportion joined by chemical bonds into a molecule.
Glucose is the main provider of energy for the brain and the nervous system. Because the brain is so rich in nerve cells, or neurons, it is the most energy demanding organ, using one half of all the sugar energy in the body. Brain functions such as memory, thinking and learning are closely linked to glucose levels and how efficiently the brain uses this fuel source.
Enzymes are biological catalysts.They lower the activation energy necessary for the reaction to occur, and that makes the chemical reactions quicker in living cells.
Rubber factories, smoking cigarettes, and cars.
