One could be the lighting of a firefly, because there is a chemical reaction that happens inside of the firefly that makes it glow, and another could be making food, because you have to add baking soda in some foods, and it reacts with other ingredients. Hope that helps.
Heyo, the answer to the question would be B.) Less developed countries do not have access to safe and reliable family-planning and health care as do more developed countries.
