Answer:
I believe your first two are correct but your bottom two should be rearranged. Have you tried looking it up?
Explanation:
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').
Answer:
You should always think about the values and pros and cons before making a major decision to ensure that you are going to make the right decision, and that you'll be happy with your choice.
Answer:
experiencing a lack of mental concentration
Explanation:
i think
