Life Over Time

12345678910111213141516171819202122232425262728
Across
  1. 1. worms, bacteria and fungi are examples of _______________
  2. 5. an organism that is made up of only one cell
  3. 11. scientist who hypothesized that small changes in rock have collected over hundreds of millions of years
  4. 12. scientists who stated that organisms could acquire and pass on traits they needed to survive
  5. 13. type of reproduction in which a single parent produces offspring that are identical to the parent
  6. 14. era in which dinosaurs and other reptiles dominated Earth
  7. 16. ___________ fossils are fossils that fill in the gaps in the fossil record
  8. 19. a change in genetic material
  9. 22. naturally occurring differences within a species
  10. 24. occurs when all members of a species have died
  11. 25. a change that affects the activity of an organism
  12. 26. the genetic material that controls the structure and function of cells
  13. 28. era in which life moved onto land
Down
  1. 2. organisms that eat other organisms to get food
  2. 3. an organism that is made up of more than one cell
  3. 4. time in which life began to evolve and oxygen increased
  4. 6. an inherited trait that helps an organism survive and reproduce in its environment
  5. 7. a membrane-covered structure that contains all of the materials necessary for life
  6. 8. type of reproduction in which two parents produce offspring that share the characteristics of both parents
  7. 9. the maintenance of a stable internal environment
  8. 10. ______________ selection is the process by which organisms that inherit advantageous traits tend to reproduce more successfully than other organisms do
  9. 15. the process by which populations change over time
  10. 17. ____________ selection is the practice by which humans select plants or animals for breeding based on desirable traits
  11. 18. your body maintains homeostasis by doing this when it gets cold
  12. 20. plants and algae are examples of ________________
  13. 21. the remains or imprints of once-living organisms
  14. 23. method of asexual reproduction in which a new organism grows on the parent organism until it is ready to separate
  15. 24. the study of development
  16. 27. era in which primates evolved; our current era