The heart has 4 chambers.
A simple example is a connection between the circulatory and respiratory systems. <span>As </span>blood<span> circulates through your body, it eventually needs fresh oxygen </span><span>from the air. When the </span>blood<span> reaches the lungs, part of the </span>respiratory system<span>, the </span>blood<span> is re-oxygenated.</span>
Answer:
They inherit it from their parents or it is due to them living in a different environment.
Explanation:
The discover things from the past
