Answer:
The second option. Increase
Answer:
the muscle tissues of arteries are thicker than the muscle tissues of veins.
Explanation:
the muscle tissues of arteries are thicker than those of veins because they carry oxygenated bloody to all the body parts(except the pulmonary artery)
I believe the answer would be d.muscle cramps. Breathing in toxins seems like it could relate to the other three answers.
