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the blood vessel that carries blood from the liver to the inferior vena cava.
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
the gamete-producing phase that produces the zygote from which the sporophyte emerges.
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...