The heart’s electrical system is responsible for making and conducting signals that trigger the heart to beat. These signals cause the heart’s muscle to contract. With each contraction, blood is pumped throughout the body. This happens 24/7 without us having to monitor it all the time so that our heart does not stop.
Answer:
A
Explanation:
Less pollution means less greenhouse gasses being emitted.
Answer:
a large warship that carries planes and has a long flat deck for takeoffs and landings
Explanation:
The answer is d- <span>psychoneuroimmunology</span>
