as representatives of early plant grade
we may study Bryophytes - mosses & allies
small, low; no skeleton
erect only by cellulose cell-walls & turgor
poor fluid transport, no true roots or cuticle;
nutrients & H2O absorbed over whole body
needs free H2O for fertilization; sperm swims
but can withstand extended desiccation
and temperature extremes [-100° to +100°C]
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