In what organisms are you referring to?
The *heart* is the main organ of the circulatory system.
The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
Answer:
The given statement is False.
Human health is affected by the environment limiting factors. The limiting factors like food, water and some other resources are responsible for the human health and hygiene. The both the biotic and abiotic factors are responsible for the human health.
Answer:
No, If that was the case, then we should only be eating carbohydrates.
