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Select one of the following pairs of imp...

Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinties with angiosperms:

A

Absence of resin duct and leaf venation

B

Presence of vessel elements and absence of archegonia

C

Perianth and two integuments

D

Embryo development and apical meristem

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