Evolution and Natural Selection

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Across
  1. 4. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
  2. 6. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
  3. 7. the branch of biology and medicine concerned with the study of embryos and their development.
  4. 9. the quantitative representation of individual reproductive success.
  5. 13. a change or the process of change by which an organism or species becomes better suited to its environment.
  6. 14. the difference in DNA among individuals or the differences between populations.
  7. 16. a group of organisms that can reproduce with one another in nature and produce fertile offspring.
  8. 17. the action or process of mutating.
  9. 18. biological classification ranking between family and species, consisting of structurally or phylogenetically related species or a single isolated species exhibiting unusual differentiation (monotypic genus).
  10. 19. the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers
Down
  1. 1. the establishment of a hierarchical system of categories on the basis of presumed natural relationships among organisms.
  2. 2. the fact or process of a species, family, or other group of animals or plants becoming extinct.
  3. 3. one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
  4. 5. When the living organisms produce more offspring than that can survive
  5. 8. a change or the process of change by which an organism or species becomes better suited to its environment.
  6. 9. any of numerous passerine songbirds (families Fringillidae, Estrildidae, Emberizidae, and Cardinalidae) having a short stout usually conical bill adapted for crushing seeds
  7. 10. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
  8. 11. a hypothesis, a theory or a tenet assuming that change comes about gradually or that variation is gradual in nature and happens over time as opposed to in large steps.
  9. 12. the influence of closely associated species on each other in their evolution.
  10. 15. the formation of new and distinct species in the course of evolution.