Unit B Crossword

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Across
  1. 5. calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element,
  2. 8. a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
  3. 9. a self-replicating material that is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
  4. 10. is the science of naming, describing and classifying organisms and includes all plants, animals and microorganisms of the world.
  5. 11. the branch of biology that deals with the geographical distribution of plants and animals.
  6. 13. the process by which organic matter exposed to minerals over a long period is turned into a stony substance.
  7. 14. having become functionless in the course of evolution.
  8. 17. the branch of biology and medicine concerned with the study of embryos and their development.
  9. 18. the highest rank of organisms, higher than a kingdom.
  10. 20. is a rank in the biological classification (or taxonomy). It stands above species, and below families.
Down
  1. 1. Species, in biology, classification comprising related organisms that share common characteristics and are capable of interbreeding.
  2. 2. the branch of science concerned with fossil animals and plants.
  3. 3. a distinguishing quality
  4. 4. is the physiological maximum potential reproductive output of an individual (usually female) over its lifetime
  5. 6. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
  6. 7. a plant or animal native and restricted to a certain place.
  7. 12. It is a process in which a less stable nuclei spontaneously breakdown or decomposes into a stable nuclei.
  8. 15. similar in position, structure, and evolutionary origin but not necessarily in function.
  9. 16. performing a similar function but having a different evolutionary origin, such as the wings of insects and birds.
  10. 19. a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.