In angiosperms, xylem consists of tracheids and
a) sieve tubes
b) companion cells
c) vessel elements
d) parenchyma

hi there

your answer to this is :   C) vessel elements

EXPLATION:

The most distinctive xylem cells are the long treachery elements that transport water. Tracheids and vessel elements are distinguished by their shape; vessel elements are shorter, and are connected together into long tubes that are called vessels. Xylem also contains two other cell types: parenchyma and fibers.

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FaithRawlins14

it marks things for degradation via the proteasome. it alters there celluar location.