Answer:a
Explanation: because blood is pumped out of the heart and into the body to supply oxygen to working muscles or to the lungs for re-oxygenation
Answer:
See explanation below.
Explanation:
From the definition of adjacent angles, the sum of measure of all the adjacent angles on a horizontal line equals to
.
From the given figure, we have:

And from the definition of alternate angles, we have:

Helps prevent blood clots
They stay together, through good times and bad