Biology

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Across
  1. 2. The process through which populations of living organisms adapt and change.
  2. 12. Single-celled organisms with no distinct nucleus
  3. 13. The process of evolution between two species that interact with each other.
  4. 15. Reproduction that doesnt require the fusion of gametes.
  5. 16. preserved remains of organisms from the past
  6. 17. One of two or more versions of a gene
  7. 18. A form of asexual reproduction
  8. 19. individuals in a population, or community, are more likely to survive if they are fit
Down
  1. 1. special body parts that help a plant or animal survive in an environment.
  2. 3. Has a clear distinct nucleus
  3. 4. The creation of a new species
  4. 5. similar physical features in organisms that share a common ancestor
  5. 6. differences in sequences of genes between individual organisms of a species.
  6. 7. an animal does usually in response to some type of external stimulus in order to survive
  7. 8. lacks a distinct nucleus and other organelles
  8. 9. when the sperm from the male parent fertilizes an egg from the female parent
  9. 10. The dying out of a species
  10. 11. random fluctuations in the frequencies of alleles from generation to generation
  11. 14. Adjusting to new environments or to changes.
  12. 20. the study of the development of an embryo and fetus.