Across
- 4. asexual reproduction by a separation of the body into two new bodies
- 5. choosing parents with particular characteristics to breed together and produce offspring
- 6. branch of science that is related to the formation, growth, and development of embryo
- 7. structural modification made to a part of the body
- 8. mechanisms of gene transfer from one population to another
- 10. An organism can change to adjust to its immediate habitat/environment
- 11. microscopic, single-celled organisms that exist inside and outside other organisms
- 15. very simple microorganisms that infect cells and may cause disease
- 17. reproduction of viruses using a host cell to manufacture more viruses
- 18. the fusion of male and female gametes to create organisms
- 19. provides a record of how creatures evolved
- 20. Different organisms vary in how they look and function
Down
- 1. the process through which populations of living organisms adapt/change
- 2. method by which a virus can replicate its DNA using a host cell
- 3. something an animal does usually in response to some type of external stimulus to survive
- 9. organisms whose cells contain a nucleus and other membrane-bound organelles
- 12. one parent copies itself to form a genetically identical offspring
- 13. individuals compete for access to mates and fertilization opportunities
- 14. any organism that lacks a nucleus and other organelles due to the absence of internal membranes
- 16. the complete disappearance of a species from Earth