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Life Science Week 1: Welcome, Life Scientists!

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