Across
- 3. independent of evolution of similar features
- 6. organisms species die out completely
- 7. influence of different species on evolution
- 8. can cause disease in humans
- 9. when a population’s size is reduced
- 10. human modification of organism traits
- 14. when a subgroup of species evolves
- 15. can multiply in a living host
- 16. the study of embryos and development
- 18. environment influenced organism changes
- 19. reduction is genetic variation in one species
- 20. genetic combination of a male and female
Down
- 1. multi-celled organisms
- 2. single-celled organisms
- 4. reproduction of organisms with better survival traits
- 5. organs that become reduced through evolution
- 11. natural selection caused by sexual preferance
- 12. offspring produced by a single parent
- 13. physical record of how species evolve
- 17. external structures evolved from environmental challenges