1. biology
2. unicellular
3. multicellular
4. prokaryote
5. eukaryote
6. sexual reproduction
7. asexual reproduction
8. energy (metabolism)
9. DNA
10. evolution
11. cell
12. tissue
13. organ
14. organ system
15. organism
16. density
17. cohesion
18. adhesion
19. polar
20. universal solvent
21. monomer
22. polymer
23. hydrolysis
24. dehydration synthesis/condensation reaction
25. organic macromolecule
26. carbohydrate
27. lipid
28. protein
29. amino acid
30. nucleic acid
31. enzyme
32. activation energy
33. active site
34. pH
35. denature
36. nucleus
37. ribosome
38. mitochondria
39. Golgi apparatus
40. chloroplast