Answer is in the photo. I can only upload it to a file hosting service. link below!
tinyurl.com/wpazsebu
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.
For question 1. Your answer is most likely A.
And for the record. H2O is a compound.
Hello!
The term that describes the amount of water vapor in the air is absolute humidity.
