Evolution and Natural Selection

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Across
  1. 5. inherited characteristic that increases an organism's chance of survival
  2. 6. body parts that share a common function, but not structure
  3. 7. the branch of biology and medicine concerned with the study of embryos and their development
  4. 8. structures in different species that are similar because of common ancestry
  5. 11. a structure that is present in an organism but no longer serves its original purpose
  6. 13. any difference between individuals of the same species
  7. 14. a characteristic that an organism can pass on to its offspring through its genes
  8. 16. the top rock layer and its fossils is the youngest and the bottom is the oldest
  9. 17. a preserved remnant or impression of an organism that lived in the past
  10. 18. a species that is most suited to survive in a certain type of environment
Down
  1. 1. bodies within the nucleus made in DNA and proteins called the histones
  2. 2. the formation of new and distinct species in the course of evolution
  3. 3. a natural process resulting in the evolution of organisms best adapted to the environment
  4. 4. the gradual change in a species over time
  5. 9. a random error in gene replication that leads to a change
  6. 10. ability of an animal to look like another more harmful animal
  7. 12. a group of organisms that are closely related and can mate to produce fertile offspring
  8. 15. fossils that provide patterns of evolutionary change from the early ancestors to modern life forms