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A common structural feature of vessel elements and sieve tube elements are

1. pores on lateral walls
2. presence of p-protein
3. enucleate condition
4. thick secondary walls

Correct answer: enucleate condition

Solution

Both vessel elements and sieve tube elements are enucleate at maturity, meaning they lack a nucleus. This is a shared structural feature, whereas thick secondary walls are typical of vessel elements but not sieve tubes, and p-protein is specific to sieve tubes.

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