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a special kind of biological identification key which consists of sets of organised pairs of statements, descriptions or choices about features or structures that the organism may or may not have.
process by which cells become specialised to perform a specific function.
tough connective tissue found in conjunction with muscle, cartilage and bone.
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...