The circulatory system keeps the body and its tissues continuously oxygenated. It does this by having

Arteries to carry oxygenated blood to the tissues and veins to carry deoxygenated blood from the tissues to the lungs.

Explanation:

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igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy