Xylem and Phloem make up Vascular Tissue.
Both have phosphate-pentose back bone, as well as both have adenine, cytosine and guanine bases.
Progesterone.
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Level 1 - Cells.
Level 2 - Tissues.
Level 3 - Organs.
Level 4 - Organ Systems.
Level 5 - Organisms.
