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

answer=(oversee the conversion of peacetime industry to war industry)

hope this : d

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.