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Across 6. COMPLEX DIAGRAM OF ALL THE FEEDING RELATIONSHIPS IN AN AREA 9. PROPOSED THE IDEA OF NATURAL SELECTION 12. THE ABILITY OF AN ORGANISM TO TOLERATE A CHEMICAL 14. VARIETY, MANY DIFFERENT KINDS 15. ORGANISM THAT ARE BETTER SUITED SURVIVE 18. A GENETIC CHANGE IN A POPULATION OVER GENERATIONS 19. UNICELLULAR, COMMON, CAN BE FOUND EVERYWHERE 22. ALL NON-LIVING THINGS IN AN ECOSYSTEM (AIR, ROCKS, WATER) 23. TWO SPECIES EVOLVING AND RESPONDING TO EACH OTHER 24. UNICELLULAR, NO NUCLEUS, LIVE IN HARSH AREAS

Down 1. ALL THE MEMBERS OF A SPECIES LIVING IN THE SAME AREA 2. SIMPLE ONE WAY DIAGRAM OF WHAT EATS WHAT 3. VARIOUS SPECIES LIVING IN THE SAME PLACE AND INTERACTING 4. ALL ORGANISMS LIVING IN AN AREA IN THEIR ENVIRONMENT 5. A GROUP OF ORGANISMS THAT CAN PRODUCE FERTILE OFFSPRING 7. FATHER OF THE LATIN SYSTEM OF CLASSIFYING LIVING THINGS 8. SELECTIVE BREEDING TO "IMPROVE" A SPECIES 10. AN INHERITED TRAIT THAT INCREASES THE CHANCE OF SURVIVAL 11. ALL LIVING THINGS IN AN ECOSYSTEM 13. PHOTOSYNTHETIC, MULTICELLULAR 16. UNEXPECTED GENETIC OUTCOME 17. A SINGLE LIVING THING 20. CONSUMERS, VERTEBRATES + INVERTEBRATES 21. WHERE AN ORGANISM LIVES