1. Oxygen poor blood returns from the body through the inferior and
superior vena cavas. From these veins, blood flows into the what ventricle

The right ventricle

Explanation:

Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. This then causes ressure change, the valves to the vena cava and closes and the blood is pushed through the right atrium to the right ventricle.

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hope this : )