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Life Science Week 1: Welcome, Life Scientists!

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Across
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Animals without a backbone
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The living things whose name means "first animals"
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Plants that cannot move fluids within them and never have flowers
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Scientists have found fossils of these living things that are about 3.5 billion years old
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When two living organisms do something useful for each other
Down
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Plants with tubes that can move fluid within themselves
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Comes from the Greek word meaning "knowledge of life"
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Animals with a backbone
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The science of putting things with similar traits into groups