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Ranunculus Root Cross Section. The endodermis is the innermost layer of cortex in land plants.It is a cylinder of compact living cells, the radial walls of which are impregnated with hydrophobic substances (Casparian strip) to restrict apoplastic flow of water to the inside. [1]
Around the same time the aquatic, scorpion-like eurypterids became the largest ever arthropods, some as long as 2.5 m (8 ft 2 in). [ 80 ] The oldest known arachnid is the trigonotarbid Palaeotarbus jerami , from about 420 million years ago in the Silurian period. [ 81 ] [