Biology
Radical vascular bundles are those in which

xylem and phloem occur on the different radii
xylem is surrounded by phloem
phloem is surrounded by xylem
xylem and phloem occur on the same radius

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Biology
Which is not a function of the cell membrane?

Helps substances pass from the cytoplasm into the nucleus
Keeps materials within the cell separated from the environment outside the cell
Allows the cell to change shape under pressure
Helps control the movement of materials into and out of the cell

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