Across
- 3. the study of embryos and their development
- 6. target bacteria
- 8. a cause of variations in genetics
- 10. the age of an object in relation to the ages of other objects
- 14. the transfer of genes between different individuals in a species
- 16. unicellular with no nucleus
- 17. target viruses
- 18. characteristics of organisms that enhance their survival and reproduction in specific environments
- 19. same species
- 20. are body parts that are similar in structure but are different in function
- 21. structures that seem to be left over from a previous ancestor and seem to serve no purpose in the living organism
Down
- 1. the actual age of the fossil given in years
- 2. all organisms are related to one another
- 4. when there is a limited amount of resources required for life in ecosystems
- 5. shows when new groups appeared in Earth's history and how they changed over time
- 7. the trait that allows the organism to survive the best is passed on
- 9. immunity where your own body produces anitbodies
- 11. heritable change in characteristics within a population from one generation to the next
- 12. a long period of time when a population is uniantibodies
- 13. creation of a new species
- 15. adaption against malaria
- 16. immunity where you are given or passed antibodies