Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number. All of the answers use the singular form of the word (no 's' on the end).

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Across: 1. Things in an environment that can change things about an organism e.g. the anount of food available (13, 7) 3. An animal with no backbone (12) 5. The surroundings of an organism. (11) 6. A verbebrate with dry scales. It reproduces by laying eggs with a leathery shell. (7) 7. A group of organisms that can reproduce with each other. (7) 8. Vertebrates with wet scales and breathe using gills (4). 10. Sorting things or organisms into groups (14). 12. All of these invertebrates have jointed legs and a thick, hard, exoskeleton (9) 13. The differences between things (9) 14. Give birth to live young, produce milk, and bodies covered in hair (6)

Down: 2. These characteristics are passed on to you from your parents (9,9) 4. Type of arthropod with four pairs of legs e.g. a spider (8) 9. Type of arthropod with three pairs of legs and a body in three sections (6) 11. A living thing (8)