Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms.
1. absence of resin duct and leaf venation
2. presence of vessel elements and absence
of archegonia
3. periandl and two integuments
4. embryo development and apical meristem
Subtopic:  Examples of Gymnosperms |
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