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(also called selectively permeable membrane) a membrane which allows some substances to cross it, but not others.
region of the kidney into which urine is discharged from the collecting ducts of the nephrons,...
(also called lithospheric plates) massive, irregularly shaped slabs of solid rock.
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
nutrients are obtained by digesting organic compounds that have to be acquired and ingested by...