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Across 5. the whole of space 7. a species that has worryingly low numbers left alive 12. changes in organisms over thousands/millions of years 16. a measure of how hot or cold something is 17. an animal that can have fur or hair and produces milk for its young 18. an animal without a backbone 19. fabric that allows water vapour to escape 22. to be chemically breaking down 24. the increase in the Earth's temperature due to CO2 28. something that speeds up a biological or chemical reaction 29. an animal with a backbone 30. non-renewable fuels such as gas, oil and coal 31. the surname of your teacher 32. animals that can live on land and in water

Down 1. a type of energy that doesn't run out 2. an animal that eats other animals 3. central part of an atom 4. element present in CO and CO2, not oxygen 6. therapeutic drug that kills viruses 8. mixture of gases above the earth 9. features of an organism that helps it survive 10. therapeutic drug that kills bacteria 11. a condition that can occur when the body gets too cold 13. to lose to much water 14. chemical found in red blood cells 15. a way of protecting a species or environment 19. material that can be broken down by microorganisms 20. animals that feed on plants only 21. a collection of planets and other objects orbiting the sun 23. the number of species in a habitat 25. substance made by yeast fermentation 26. to rot 27. harmful organism that can cause disease