I’m pretty sure it’s true! Good luck :))
youre answer is chronic bronchitis
Answer:
Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change
Answer: B: Contact between infected saliva and an open wound.
Explanation: It gets in your blood stream. For example, sharing needles.