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cartilage cells.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
middle body tissue layer that forms the muscular, circulatory and excretory systems.
region of the kidney into which urine is discharged from the collecting ducts of the nephrons,...
gaps (about 1 micrometre long) that occur between the myelin sheaths generated by consecutive...
the widespread and rapid extinction of species in the present age due to negative human impact...