Biology and the Tree of Life

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Across
  1. 2. The evolutionary history of a group of organisms.
  2. 6. A unicellular organism lacking a nucleus and containing relatively few organelles or cytoskeletal components.
  3. 8. The theory that all organisms on Earth are related by common ancestry ad that they have changed over time.
  4. 10. The hypothesis that all cells arise spontaneously from nonliving materials.
  5. 12. The process by which individuals which certain heritable traits tend to produce more surviving offspring than individuals without those traits, often leading to a change in the genetic makeup of the population.
  6. 13. A group of organisms of samples that do not receive the experimental treatment but are otherwise identical to the group that does.
  7. 15. Any heritable trait that increases the fitness of an individual with the trait in a particular environment.
  8. 18. The unique, two-part name given to each species, with a genus name followed by a species name.
  9. 20. The theory that all organisms are made of cells and that all cells come from preexisting cells.
Down
  1. 1. The scientist who tested the hypothesis of spontaneous generation.
  2. 3. The term referring to traits that can be transmitted from one generation to the next.
  3. 4. An organism whose cells contain a nucleus, numerous membrane-bound organelles, and an extensive cytoskeleton.
  4. 5. The ability of an individual to produce viable offspring relative to others of the same species.
  5. 7. A group of individuals of the same species living in the same geographic are at the same time.
  6. 9. Any living entity that contains one of more cells.
  7. 11. Deliberate manipulation by humans, as in animals plan breeding, of the genetic composition of a population by allowing only individuals with desirable traits to reproduce.
  8. 14. A measurable or observable result of an experiment based on the particular hypothesis.
  9. 16. A proposed explanation for a broad class of phenomena or observations.
  10. 17. The basic structural and functional unit of all organisms.
  11. 19. The branch of biology concerned with the classification and naming of organisms.
  12. 21. A proposed explanation for a phenomenon or for a set of observations.