The blood veins is

a.leaving the lungs.

b.moving in a single file

c.traveling to the heart.

These are blood vessels that take oxygen-poor blood back to the heart. Veins become larger and larger as they get closer to the heart. The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.

C .-.

Explanation:

Cuál es la relación entre la ecología y la geografía?

¿Cuál es la relación entre ecología y ética?

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