About What Share of U

question 20

Multiple Choice

About what share of U.S.adults over the age of twenty-five are college graduates?

• A)10 percent
• B)30 percent
• C)45 percent
• D)70 percent

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Definitions:

Vascular Cylinder

Of a plant root, central column that consists of vascular tissue, pericycle, and supporting cells.

Endodermal Cells

Cells originating from the innermost layer of the embryo, which give rise to the lining of the digestive and respiratory systems.

Casparian Strip

A band of cell wall material found in the roots of plants, acting as a barrier to the passive flow of substances.

Xylem

The vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem.