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What colour is a worm's blood?
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Blood is used to carry oxygen around the body. In humans, the molecule that carries the oxygen is red in colour, giving us red blood. Other organisms may use different-coloured molecules to carry their oxygen round. Many worms have red blood; some have green. | | An earthworm, showing cross-section |
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Previous:
Back
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Book:
1001
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Section:
Nature
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Chapter:
Simple Animals
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