Answer 12-18 Like this
12.
13
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12. The ones that carry blood back to the heart are called veins.The veins (blue) take oxygen-poor blood back to the heart

13. The arteries (red) carry oxygen and nutrients away from your heart, to your body's tissues. . Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body's tissues.

more answers in the comment section below:

12. veins or vena cava

13. arteries

14. testes

15. digestive system

16. respiratory and circulatory systems

17. capillaries

18. ligaments

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.