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Across
  1. 2. say something in answer to a remark or accusation, typically in a sharp, angry, or wittily incisive manner.
  2. 5. a supposition or a system of ideas intended to explain something.
  3. 9. a living organism of the kind exemplified by trees.
  4. 10. a disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms or that affects a specific location and is not simply a direct result of physical injury.
  5. 11. the state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.
  6. 13. the center of a cell.
  7. 17. the branch of zoology concerned with reptiles and amphibians.
  8. 21. the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
  9. 22. the physical structure of a person or an animal.
Down
  1. 1. find out how heavy someone or something is.
  2. 3. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
  3. 4. physical substance in general.
  4. 6. the planet on which we live.
  5. 7. the smallest structural and functional unit of an organism.
  6. 8. a set of connected things or parts forming a complex whole.
  7. 10. facts and statistics collected together for reference or analysis.
  8. 12. a straight-sided, optically clear container for holding liquid samples in a spectrophotometer or other instrument.
  9. 14. an individual animal, plant, or single-celled life form.
  10. 15. 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.
  11. 16. not consistent or having a fixed pattern; liable to change.
  12. 18. the strength and vitality required for sustained physical or mental activity.
  13. 19. a laboratory.
  14. 20. deoxyribonucleic acid.
  15. 22. the study of living organisms.