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.
The amount of light entering the eye is controlled by the pupil, which is surrounded by the iris.
<span>It leads to an increase level of biodiversity.</span>
Answer: True
Explanation:
This was a bacterial fermentation that produced acetone, needed for cordite (explosive) manfacture. Species of Clostridium were used.
