BIOLOGY CROSSWORD PUZZLE

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Across
  1. 3. the vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem.
  2. 9. the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution.
  3. 10. 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. 13. the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
  5. 14. a sequence of three nucleotides which together form a unit of genetic code in a DNA or RNA molecule.
  6. 15. having one valve or shell.
  7. 17. the number and visual appearance of the chromosomes in the cell nuclei of an organism or species.
  8. 18. a temporary protrusion of the surface of an amoeboid cell for movement and feeding.
  9. 20. a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
  10. 21. the scientific study of plants, including their physiology, structure, genetics, ecology, distribution, classification, and economic importance.
  11. 22. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
  12. 24. the surface epithelium of the skin, overlying the dermis.
  13. 26. the process of eliminating or expelling waste matter.
  14. 27. interaction between two different organisms living in close physical association, typically to the advantage of both.
  15. 30. shed old feathers, hair, or skin, or an old shell, to make way for a new growth.
Down
  1. 1. a class of vertebrates which comprises the birds.
  2. 2. tending to repel or fail to mix with water.
  3. 4. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
  4. 5. a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
  5. 6. a self-replicating material which is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
  6. 7. a plastid that contains chlorophyll and in which photosynthesis takes place.
  7. 8. an interacting group of various species in a common location.
  8. 11. living matter arises only from other living matter.
  9. 12. eukaryotic organisms that are unicellular and sometimes colonial or less often multicellular.
  10. 16. the chemical breakdown of a compound due to reaction with water.
  11. 19. a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting.
  12. 23. a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
  13. 25. the highest category in taxonomic classification.
  14. 28. the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.
  15. 29. a fibrous substance consisting of polysaccharides and forming the major constituent in the exoskeleton of arthropods and the cell walls of fungi.