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a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
skeletal muscle found all over the body, attached to the skeleton.
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...