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ARC-Easy / ACTAAP_2013_7_13 / Xylem cells have very thick walls. They make up most of a tree trunk and its…

Problem

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question

Xylem cells have very thick walls. They make up most of a tree trunk and its branches. What system in vertebrates provides the same function as the xylem cells in a tree?

choices

  • the skeletal system
  • the endocrine system
  • the respiratory system
  • the integumentary system

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