Answer:
B- Are constantly replacing themselves,
Answer:
Explanation:
The Circulatory system pumps blood around the body, and the respiratory system facilitates the gas exchange that keeps the blood fresh. The heart is connected to the lungs via the pulmonary arteries and veins.
The circulatory and respiratory systems work together to deliver oxygen and other important nutrients to every cell in our bodies. All of our body cell require oxygen to conduct cellular respiration. In this process, oxygen burns the nutrients from foods w eat, providing energy for the cells. The respiratory system is responsible for bringing oxygen into the body and removing waste gasses.
Read more on Brainly.com - brainly.com/question/1549761#readmore
The four leading causes of death in the united states are :
1. Heart Disease
Could e prevented by doing regular cardio activity
2. Cancer
Avoid smoking. Avoid exposing yourself to sunlight without sun screen
3. Stroke
could be prevented by eating less cholesterol
4. Accidents
Could be prevented by following regulations and not exposing yourself to alcohol before driving
hope this helps
