living environment

Edit Answers
123456789101112131415161718192021222324252627282930
Across
  1. 4. Earth's history as revealed by layers of rock
  2. 6. a protein, produced by the immune system, that either attacks invading pathogens or marks them for killing
  3. 11. any trait that helps an organism survive and reproduce under a given set of environmental conditions
  4. 13. a molecule found on the outer surfaces of cells that the immune system recognizes as either part of the body or an outside invader
  5. 15. the process by which scientists carefully examine the work of other scientists to look for possible flaws in their experimental design or their interpretation of results
  6. 17. a method of reproduction that involves two parents to produce offspring that are genetically different from either parent
  7. 19. an organism that produces its own food; the sources of energy for all other living things on Earth
  8. 20. a medicine produced by microorganisms used to destroy pathogens in humans and domestic animals
  9. 22. the first organisms to become established in a new habitat
  10. 23. the passing of traits form parent to offsprings
  11. 25. the constant small corrections that normally occur to keep an organism's internal environment within the limits needed for survival
  12. 26. a method of reproduction in which all the genes in which all the genes passed on to the offspring come from a single individual or parent
  13. 27. the chemical link between atoms that hol molecules together
  14. 28. any mircoscopic organism
  15. 30. the additional mixing of genetic material from a sperm and egg which results in a unique combination of genes
Down
  1. 1. any chance in the environment that causes an organism
  2. 2. the curved surface at the top of a column of liquid
  3. 3. a balance that measures mass automatically
  4. 5. the removal of all the wastes produced by the cells of the body
  5. 7. a chemical process that occurs in a living thing
  6. 8. a tool used to measure the volume of a liquid
  7. 9. tiny pores found on the underside of most leaves
  8. 10. a cycle in which the output of a system either modifies or reinforces the first action taken by the system
  9. 12. organism that cannot make its own food; a consumer
  10. 14. the destruction of an organism, or the removal of an organism from its habitat
  11. 16. a state of balance and stability
  12. 18. the disease that results when the HIV virus attacks the human immune system
  13. 21. the formation of a new combination of genes during sexual reproduction
  14. 24. the combination of technology and biological science
  15. 29. a collection of fossils used to represent Earth's history