Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pin...
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Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
(A) Perianth, no integument
(B) Embryo development and apical meristem
(C) Absence of resin duct and leaf venation
(D) presence of vessel elements and absence of archegonia.
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