If you are active then your fitness scores may turn out to be higher because you may have great endurance etc. when it comes to sports its important to know rules and guidelines. if you know that you are sure to pass the test
Answer: B: Contact between infected saliva and an open wound.
Explanation: It gets in your blood stream. For example, sharing needles.
The Respiratory System brings oxygen into the blood; it is the responsibility of the Circulatory System to transport it, with nutrients from digestion, to cells of the body.
The Circulatory System is three-fold: the blood carrying the substances, the vessels in which blood flows, and the heart which pumps it around in a circle-like movement and back (hence the term 'circulatory').
