Insulin. Although it is made in the pancreas, insulin is the hormone.
Examples:
Respiratory System, (I think) Organ System, Circulatory System, Nervous System, etc.
Answer:
2
Explanation:
that is what evolution says
The reaction of sodium bicarbonate (baking soda) and acetic acid (vinegar) produces carbon dioxide gas, water and sodium acetate (soluble in water). The carbon dioxide gas can originally be seen as bubbles in the solution, but will quickly be released from the solution.