The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood.
they work together by the person breathing. the respiratory and circulatory system are actually connected because the respiratory system is because it's the lungs. the lungs provide air for the for the body. the circulatory system is where the heart is placed. when the body breathes in air it expands the lungs and takes out co2, once the lungs expand it pumps the heart to keep pumping blood to the body which provides everything else in the body. if the heart doesn't have air/blood going thru it its starts to panic and die slowly.
Levels of organization in ecology include the population, community, ecosystem, and biosphere. An ecosystem is all the living things in an area interacting with all of the abiotic parts of the environment.
