Circulation of the circulatory system brings carbon dioxide filled blood to the lungs is called the what

How can a person  best  reduce the risk of injuries on the road?  

Which of these is a sexual stereotype?

Zoom out so that you can see the whole state of california. select the ruler tool again, but change the type of measurement from line to path. create a path from san francisco to las vegas, to los angeles, to san diego. what is the total length of this path in kilometers and in meters?