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unable to notice or respond to things that you would usually be aware of through your senses.
a naturally occurring sequence of organisms from the various trophic levels that feed on each...
epithelial tissue consisting of a single layer of cells.
emitting (or giving off) radiation energy, which is harmful to living organisms.
water-proof, waxy suberin-thickened layer on the radial and transverse cell walls of the...
two or more forms of a particular chemical element, that have the same number of protons in the...