crossword

4. chain series of steps in which organisms transfer energy by eating and being eaten
5. one of a number of different forms of a gene
7. evidence; information gathered from observations
9. process that requires oxygen
10. smallest blood vessel
13. compound that produces hydroxide ions in solution
15. area of the brain responsible for all voluntary activities of the body
16. sequence of DNA that codes for a protein and thus determines a trait
18. science that seeks to understand the living world
19. wall strong supporting layer around the cell membrane

1. group of ecosystems that have the same climate and dominant communities
2. factor biological influence on organisms within a ecosystem
3. amount of energy needed to raise the temperature of 1 gram of water by 1 degree celcius
6. collection of all the organisms that live in a particular area, together with their nonliving environment
8. inherited characteristic that increases an organisms chances of survival
11. attraction between molecules of different substances
12. mixture of stomach fluids and food produced in the stomach
14. protein that acts as a biological catalyst
17. expressed sequence of DNA