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Which statement below correctly describes the relationship between expansion rate and age for the universe?
Secondary Xylem
The part of the xylem that is formed after the plant's initial growth, contributing to the thickening of the plant stem.
Primary Phloem
The part of the plant's vascular system that conducts sugars and other metabolic products downward from the leaves.
Cork Cambium
Cork cambium is a layer of meristematic tissue in plants that produces cork cells to protect and waterproof the plant.
Periderm
The outer protective layer of a plant's bark, produced as part of secondary growth, replacing the epidermis in mature plant stems and roots.
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