Science

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Across
  1. 4. - The variety of life in a particular habitat or ecosystem.
  2. 6. - Two or more atoms bonded together.
  3. 7. - A microscopic infectious agent that replicates inside the cells of living organisms.
  4. 9. - The smallest structural and functional unit of an organism.
  5. 15. - The process by which two atomic nuclei combine to form a heavier nucleus.
  6. 16. - Variants of a chemical element that have the same number of protons but different numbers of neutrons.
  7. 17. hole - A region in space where gravity is so strong that nothing, not even light, can escape.
  8. 18. - The green pigment in plants that absorbs light for photosynthesis.
  9. 19. - A substance that donates protons (hydrogen ions) and has a pH less than 7.
  10. 21. - A subatomic particle with no electric charge found in the nucleus of an atom.
  11. 24. - A negatively charged subatomic particle that orbits the nucleus of an atom.
  12. 25. - A protein produced by the immune system to neutralize pathogens.
  13. 27. - The minimum amount of energy that can be gained or lost by an atom.
  14. 28. - The movement of water molecules through a semipermeable membrane.
  15. 29. - A unit of heredity that is passed from parent to offspring.
Down
  1. 1. - The process by which plants convert sunlight into energy.
  2. 2. - The force that attracts objects with mass toward each other.
  3. 3. - The preserved remains or traces of ancient organisms.
  4. 5. - A change in the genetic sequence of an organism.
  5. 8. - A nerve cell responsible for transmitting electrical signals in the body.
  6. 10. - A community of living organisms interacting with their environment.
  7. 11. - The gradual development of organisms over time.
  8. 12. - The speed of something in a given direction.
  9. 13. - The energy an object possesses due to its motion.
  10. 14. - Relating to the structure of the Earth's crust and the movement of its plates.
  11. 20. - The molecule that carries genetic information in living organisms.
  12. 22. - The process of transformation in an organism's life cycle, such as a caterpillar turning into a butterfly.
  13. 23. - The resistance of any physical object to a change in its motion.
  14. 25. - The basic unit of matter, consisting of protons, neutrons, and electrons.
  15. 26. - A machine that converts kinetic energy from fluid (air or water) into mechanical energy.