How are sieve tube elements able to carry out general cellular maintenance while lacking structures such as a nucleus, Golgi apparatus, and ribosomes?
A) Being dead cells, there is no need for general cellular maintenance.
B) Sieve tube elements acquire all they need from the phloem sap.
C) Companion cells carry out all of these tasks.
D) These cells die quickly and are routinely regenerated.
E) Sieve tube elements acquire all they need from the xylem.
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