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very small organisms that are invisible to the naked eye.
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
undifferentiated cells found in almost all organisms that have the ability to develop into any...
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
lasting or continuing throughout the entire year, as a stream.
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.