Question

which characteristic do gnetophytes and cycads have in common?
o are all deciduous
o may grow in tropical climates
o grow as vines
o are mostly low-lying shrubs
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Explanation:

• Gnetophytes: Some species of gnetophytes can grow in tropical climates. For example, Welwitschia mirabilis is found in the Namib Desert (which has some regions with a climate that can be considered in the broader context of arid - tropical or subtropical influence).
• Cycads: Many cycad species are native to tropical and subtropical regions. For instance, Cycas revoluta is often cultivated in tropical and subtropical gardens.

• Deciduous: Gnetophytes like Ephedra are not all deciduous (some are evergreen - like), and cycads are generally evergreen.
• Grow as vines: Gnetophytes do not typically grow as vines, and cycads have a more arborescent (tree - like) or shrub - like growth form (not vine - like).
• Mostly low - lying shrubs: Gnetophytes can have different growth forms (e.g., Welwitschia has a unique growth form that is not a low - lying shrub in the traditional sense), and cycads can be tree - like (e.g., some Cycas species can reach relatively large sizes, not just low - lying shrubs).

Answer:

may grow in tropical climates