Biology
Most of the red, blue and purple colours of plants are due to a pigment called

anthocyanin
xanthophylls
carotene
chlorophyll

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Biology
Which is not a function of the cell membrane?

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

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