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Science: Week #8 Crossword Puzzle Life Science

Across
There are four of these in the human heart
A bone in your neck not connected to any other bones
There are 60,000 miles of these in an adult human
There are 45 miles of this in an adult human
Another word for joined
Down
Cells that make up nerves
Tiny blood vessels just underneath your skin
A newborn baby has about 270 of these, while an adult has 206
A long tube leading from your mouth to your stomach