a non-cancerous tumour.
the liquid found in the pleural cavity that acts as a lubricant.
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
a chemical used as an antiseptic to prevent bacterial and fungal growth.
a ring of muscle that controls the passage of substances through a tube or body opening.
the space that exists between the two layers of the pleura.
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