Across
- 2. Joining of sperm and egg
- 3. Warming caused by trapped heat
- 4. Factor kept constant
- 5. How close results are to true value
- 7. Reaction with oxygen releasing heat
- 8. Organ that produces eggs
- 11. Energy that cannot run out
- 14. Describes observations using numbers
- 16. Factor that can change in an experiment
- 18. One parent creates identical offspring
- 20. Chemical messengers in the body
- 24. Movement of carbon through Earth
- 25. An educated scientific guess
- 26. Describes observations using words
- 30. Unit of force
- 31. Cell division that creates gametes
- 33. A change in DNA sequence
- 35. Rate of change of velocity
- 36. Reaction that absorbs heat
- 39. Two parents create genetic variation
- 41. Removal of large forest areas
- 42. When substances form new products
Down
- 1. First cell formed after fertilisation
- 2. Fuels from ancient organisms
- 6. Long-term changes in climate
- 9. How consistent repeated results are
- 10. Basic unit of heredity
- 12. Reaction that releases heat
- 13. Amount of matter in an object
- 15. Speed in a given direction
- 17. Different form of a gene
- 19. Release of gases into the air
- 21. Solid that forms in a solution
- 22. Resistance to change in motion
- 23. Organ that produces sperm
- 27. Trait expressed with one allele
- 28. Structure that carries genetic information
- 29. A push or pull
- 32. Molecule that stores genetic code
- 34. Force that opposes motion
- 37. Starting substance in a reaction
- 38. Trait expressed only with two alleles
- 40. Substance formed by a reaction