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preserved remains or traces of organisms that lived long ago.
liquid that drains out of a landfill and is contaminated with solutes from the waste matter
any disease that is caused by a virus or a bacterium or any other micro-organism.
fats that are solid at room temperature and are found in animals. They are thought to be linked...
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
the blood circuit from the heart to the body and back to the heart.