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

chlorophyll
carotene
xanthophylls
anthocyanin

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Biology
Which of the following is true about veins?

Veins are more muscular than arteries
Veins have a smaller diameter lumen than arteries
Veins have valves; arteries do not
Veins carry blood away from the heart, while arteries carry blood to the heart

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Biology
A genus can best be defined as

The most specific taxon
A taxon composed of one or more species and a classification level lying below family
A taxon composed of families
A taxon comprised of classes

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