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year 8 biology crossword
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Horizontal Words
- a poisonous gas produced by carbon burning burning without enough oxygen (15)
- a process in which energy is prodcuced by substances so it can be used (11)
- A blood vessel that carries blood towards the hear (4)
- a thin walled blood vessel that carries (9)
Vertical Words
- A blood vessel that carries blood away from the hear (6)
- the substance that carries blood in red blood cells (11)
- when heart muscle cells start to die (12)