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Across
3.Muscular contraction moving food along the gut
5.Class of vertebrate with fur
7.Organsim that feeds on animals
9.Deficiency disease from lack of Iron
10.Sole product of anaerobic respiration in animal cells
13.Antagonistic hormone to Insulin
16.Distinctive feature of Arthropods
17.Produces two, genetically identical cells.
18.Indigestible polymer of glucose found in plant cell walls
19.Exchange organ between mother and child
20.Increases surface area for absorption in gut
Down
1.Place where fertilisation occurs
2.Plant tissue carrying organic material
4.Microscopic gap between neurons
6.Chemical that harms bacteria but not viruses
8.Gas exchange surface on lungs
11.Pumping chamber of the heart
12.Order of mammal including bears, cats and dogs
13.Favoured respiratory substrate
14.Process extending from a neurone
15.Protein digesting enzyme that work at low pH

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