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Across 3. a system of interlocking and interdependent food chains 7. false feet 12. carbon dixide + 13. genes are found on chrosomes 15. descendants of a person 16. grass to trees to forest 18. sweet tasting 19. supportive tissue 20. ribonucleici acid

Down 1. quality of a person 2. gametes fuse together 4. oxygen allows us to produce energy 5. living organisms 6. ingestion of liquid 8. ear muscles 9. study of functions 10. state of the future 11. composed of amino acids 12. groups of classes 14. absorbs light 17. dorless tasteless white substance